be certain of
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A. 英美人士會用的正確說法1. It is certain that I have been here. (before 大可省去 因為Sb has been...
Before using dangerous chemicals, there are certain precautions to be taken. =Before we use dangerous ...
...個意思 (1) = some 某(個/些/種)的 (2) = sure 確定的、確信的 be sure that = be certain that 後面接名詞子句，表 某人「確定/確信」某事 I'm sure that...