diff --git a/packages/google-cloud-language/src/v1/language_service_client.ts b/packages/google-cloud-language/src/v1/language_service_client.ts
index dfe030c87ac..e842b0d62a2 100644
--- a/packages/google-cloud-language/src/v1/language_service_client.ts
+++ b/packages/google-cloud-language/src/v1/language_service_client.ts
@@ -278,7 +278,7 @@ export class LanguageServiceClient {
   // -- Service calls --
   // -------------------
   analyzeSentiment(
-    request: protos.google.cloud.language.v1.IAnalyzeSentimentRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeSentimentRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -328,7 +328,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeSentiment(request);
    */
   analyzeSentiment(
-    request: protos.google.cloud.language.v1.IAnalyzeSentimentRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeSentimentRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -365,7 +365,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.analyzeSentiment(request, options, callback);
   }
   analyzeEntities(
-    request: protos.google.cloud.language.v1.IAnalyzeEntitiesRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeEntitiesRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -417,7 +417,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeEntities(request);
    */
   analyzeEntities(
-    request: protos.google.cloud.language.v1.IAnalyzeEntitiesRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeEntitiesRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -454,7 +454,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.analyzeEntities(request, options, callback);
   }
   analyzeEntitySentiment(
-    request: protos.google.cloud.language.v1.IAnalyzeEntitySentimentRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeEntitySentimentRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -508,7 +508,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeEntitySentiment(request);
    */
   analyzeEntitySentiment(
-    request: protos.google.cloud.language.v1.IAnalyzeEntitySentimentRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeEntitySentimentRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -552,7 +552,7 @@ export class LanguageServiceClient {
     );
   }
   analyzeSyntax(
-    request: protos.google.cloud.language.v1.IAnalyzeSyntaxRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeSyntaxRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -600,7 +600,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeSyntax(request);
    */
   analyzeSyntax(
-    request: protos.google.cloud.language.v1.IAnalyzeSyntaxRequest,
+    request?: protos.google.cloud.language.v1.IAnalyzeSyntaxRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -635,7 +635,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.analyzeSyntax(request, options, callback);
   }
   classifyText(
-    request: protos.google.cloud.language.v1.IClassifyTextRequest,
+    request?: protos.google.cloud.language.v1.IClassifyTextRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -679,7 +679,7 @@ export class LanguageServiceClient {
    * const [response] = await client.classifyText(request);
    */
   classifyText(
-    request: protos.google.cloud.language.v1.IClassifyTextRequest,
+    request?: protos.google.cloud.language.v1.IClassifyTextRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -714,7 +714,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.classifyText(request, options, callback);
   }
   annotateText(
-    request: protos.google.cloud.language.v1.IAnnotateTextRequest,
+    request?: protos.google.cloud.language.v1.IAnnotateTextRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -763,7 +763,7 @@ export class LanguageServiceClient {
    * const [response] = await client.annotateText(request);
    */
   annotateText(
-    request: protos.google.cloud.language.v1.IAnnotateTextRequest,
+    request?: protos.google.cloud.language.v1.IAnnotateTextRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
diff --git a/packages/google-cloud-language/src/v1beta2/language_service_client.ts b/packages/google-cloud-language/src/v1beta2/language_service_client.ts
index 3ca35e8d152..4fc97c86c9a 100644
--- a/packages/google-cloud-language/src/v1beta2/language_service_client.ts
+++ b/packages/google-cloud-language/src/v1beta2/language_service_client.ts
@@ -278,7 +278,7 @@ export class LanguageServiceClient {
   // -- Service calls --
   // -------------------
   analyzeSentiment(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeSentimentRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeSentimentRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -329,7 +329,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeSentiment(request);
    */
   analyzeSentiment(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeSentimentRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeSentimentRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -366,7 +366,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.analyzeSentiment(request, options, callback);
   }
   analyzeEntities(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeEntitiesRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeEntitiesRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -418,7 +418,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeEntities(request);
    */
   analyzeEntities(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeEntitiesRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeEntitiesRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -455,7 +455,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.analyzeEntities(request, options, callback);
   }
   analyzeEntitySentiment(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeEntitySentimentRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeEntitySentimentRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -509,7 +509,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeEntitySentiment(request);
    */
   analyzeEntitySentiment(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeEntitySentimentRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeEntitySentimentRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -553,7 +553,7 @@ export class LanguageServiceClient {
     );
   }
   analyzeSyntax(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeSyntaxRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeSyntaxRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -605,7 +605,7 @@ export class LanguageServiceClient {
    * const [response] = await client.analyzeSyntax(request);
    */
   analyzeSyntax(
-    request: protos.google.cloud.language.v1beta2.IAnalyzeSyntaxRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnalyzeSyntaxRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -642,7 +642,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.analyzeSyntax(request, options, callback);
   }
   classifyText(
-    request: protos.google.cloud.language.v1beta2.IClassifyTextRequest,
+    request?: protos.google.cloud.language.v1beta2.IClassifyTextRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -690,7 +690,7 @@ export class LanguageServiceClient {
    * const [response] = await client.classifyText(request);
    */
   classifyText(
-    request: protos.google.cloud.language.v1beta2.IClassifyTextRequest,
+    request?: protos.google.cloud.language.v1beta2.IClassifyTextRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -727,7 +727,7 @@ export class LanguageServiceClient {
     return this.innerApiCalls.classifyText(request, options, callback);
   }
   annotateText(
-    request: protos.google.cloud.language.v1beta2.IAnnotateTextRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnnotateTextRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -780,7 +780,7 @@ export class LanguageServiceClient {
    * const [response] = await client.annotateText(request);
    */
   annotateText(
-    request: protos.google.cloud.language.v1beta2.IAnnotateTextRequest,
+    request?: protos.google.cloud.language.v1beta2.IAnnotateTextRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<