1.从句为陈述句,常选择引导词that,that引导宾语从句无意义,不充当句子成分常省略。例句:He told us (that they would help us through the whole work.
2.从句为一般疑问句,常选择引导词if或whether,表示“是否”。在whether … or not结构中不能用if替换。例句:I don’t know if there will be a bus any more.
3.从句为特殊疑问句,常选择what,when,where,which,who,how等的疑问代词、副词作引导词。例句:He didn’t tell me when we should meet again.
Time flies like an arrow before we realize it .It is known that nothing is more precious than time. The good old proverb "time is money" reminds us that time is valuable. When time goes by, it will never return. However, it is a pity that some people don't make full use of their time .They spend a lot of time in sleeping, chatting, playing computer games or other unmeaning matters. . They don't realize that wasting time is actually equal to killing themselves. They always regret not having made great achievements. One of the reasons may be they do not make good use of time. Therefore, in order to be successful, they should first get into the habit of being on time. It’s a sign of cherishing time. Don't put off what can be done today until tomorrow. Being lazy will eventually lead to failure. Don't wait, because you don't know how long it will take when you put off your plan.
1.主句是一般现在时,从句可以为各种时态。
2.主句是一般过去时,从句要用相应过去时态。
注意:从句描绘客观事实、真理、自然现象等,从句时态不受主句时态限制,仍用一般现在时。
例句:He answered that he was listening to me.
Father told me that practice makes perfect .
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