时间状语从句是要重点掌握的一类状语从句,其中,较难的有以下几个连接词:1.when;2.while;3.since;4.before;5. till,until, not …until。 when可作并列连词,常用于引导一个突然出现的动作,意为“那时/这时……”,此时句子的形式如下:1.Somebody was doing something wh...
31. Ben studied the menu for ___ while and then ordered his meal. A) a B) an C) the D) / 32. - Simon could look after ___ when he was five. - Really? How independent he was...
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