Welcome Maruf,
Please show your blocks, or tell us what you have tried, so that other users can understand what is going on. To download high-quality images of blocks, right click the blocks and select Download Blocks as Image. For details, please read this guide: How to ask a question (open new topic).
The SpeechRecognizer. Language block sets the language code of the input language. Specify a language by inputting the ISO 639-1 code of the language. For a list of these codes, visit List of ISO 639-1 codes - Wikipedia. Set the language of the SpeechRecognizer before starting to listen to the user.