Do you know if /whether Cathy goes to school early? 注意:只能用whether而不用if的三种情况如下: ①与or not连用:They asked us whether or not we were coming. ②在介词之后:It depends on whether it is going to rain. 3.在不定式之前:We haven’t decided whe...
【起止标识】标记非谓语动词短语时,一定是从动词不定式(to do)、动名词(doing)或分词(现在分词doing或过去分词done)开头,到以下四种情况终止。 ① 到句尾终止,如:Li Hui is a teacher (teaching English). ② 到句中的逗号终止,如:(To improve my English), I often l...
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