Do you know? 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...
2) I want to offer you some suggestions on how to … 3) It’s important/ essential/ necessary for you to do… 4) It’s a good idea for you to do… 5) You should (not) do…/...
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