一般现在时
结构: S + V(s/es) + ...
例: She teaches English.
一般过去时
结构: S + V-ed + ...
例: They visited London.
一般将来时
结构: S + will/shall + V + ...
例: I will call you tomorrow.
现在进行时
结构: S + am/is/are + V-ing + ...
例: He is reading a book.
过去进行时
结构: S + was/were + V-ing + ...
例: We were studying at 8 PM.
现在完成时
结构: S + have/has + V3 + ...
例: She has finished her work.
过去完成时
结构: S + had + V3 + ...
例: They had left before I arrived.