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___(clean). 4. It is no good ___________(play) too much puter game. 5. The library ___________(build) now will be pleted next month. to learn directed cleaned playing being built Filling the blanks using the correct verb forms. The to infinitive is often used as the subject of a sentence. When we talk about a general idea, we sometimes use verbing as the subject. To see is to believe. Laughing helps your body stay healthy and can even help you fight pain. In the following sentence pattern, we use “to do” as the subject: It is + adj. + (for sb.) to do But in the pattern “It is no use/ no good doing” we use “doing” as the subject. eg.