掌握现在时，过去时，未来时， 进行时， 完成时的各种用法。

To grasp the usage of the tenses, including the present, past, future tense and continue, perfect tense.

youdao

掌握现在时，过去时，未来时， 进行时， 完成时的各种用法。

To grasp the usage of the tenses, including the present, past, future tense and continue, perfect tense.

youdao