英語難題（對我來說）:When,while,if,as等連詞連接的狀語從句和主句用什么時態(tài)？春節(jié)愉快！！！幫忙解答?。。。?！

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when于何時；在那時；當……時；盡管（1）when did you come（2）It was raining when we arrived。（3）How can I help them to understand when they won”t listen to me?while 一段時間；當……時（和……同時）；卻（1）I”ll be back for a while（2）He fell asleep while doing homework。（3）John was dressed in brown while Mary was dressed in blueif 的用法和表?r間的連接詞 when 的用法完全一?櫻彩??連接詞，其所連接的子句，可放在句首也可放在句尾，但若是放在句首，?t和其後子句間，需要用逗?分開。例：1。 If he is right, Mary is wrong?！ary is wrong if he is right。?。?]有逗?）2。 If John washes the dishes, Bob mops the floors?！ob mops the floors if John washes the dishes?！。?]有逗?）if 所接的子句若?槲??r間，?t仍用現在?渭?式代替未?肀磉_方式。（常?錯誤）3。 假如明天下雨的?，我就不去了。　If it rains tomorrow, I won't go 。（?r間雖是 tomorrow，但在 if 所連接的子句?齲瑀ain 仍是用現在?渭?式 rains。）（1）As作“雖然”講，可用于倒裝句。例：Child as he is , he knows a lot 。（2）as常引導非限制定語從句，指主句所表達的整個內容。例：As you know , he wrote a lot of fairy tales 。（3）as作“由于”“因為”講，語氣比because輕。（4）“as +形容詞+ as +形容詞+ can be”是一種強調句型，含有最高程度的意味。例：The man is as poor as can be 。他很窮。。

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Please spend a little time reading 《英語高考必備》吧