关注TA
(2) do ,does,did (帮助句子变疑问句,否定句,强调谓语动词作用)
(3)has ,have (帮助句子变现在完成时态作用)
(4) had ,(帮助句子变过去完成时态,以及虚拟语气倒装)
(5) will ,shall (帮助句子变一般将来时态)
(6) would ,should (帮助句子变过去将来时态)
(7) be going to(帮助句子变一般将来时态)
举报纠错
were was 用在一般过去式的句子中
being 可以和别的助动词构成别的时态,例如will be beding.../have been being...
been to 用在have/has been to中 意为曾经到过。。。
to be一般用在非谓语中,例如, there are so many things to be done.
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