★We are having an English class. ★ I have seen the film. ★ He didn’t go home last night. ★ We will fly for Africa next month.
帮助主要动词have构成现在进行时
帮助主要动词see构成现在完成时
帮助主要动词go构成一般过去时
帮助主要动词fly构成一般将来时
What’s the function of the underlined words?