He should take care of the babies tonight. have to

　　have to 表示客观需要去做的事情，意为“必须，不得不。”

　　I have to get the station early to catch the first train. We missed the bus so we had to walk home. We have to overcome all kinds of difficulties.

　　Have to 有多种时态。常见的有：一般将来时， We will have to gather at the school gate at 7 tomorrow. 一般现在时 I have to take more money with me because my gf has so much to buy. 一般过去时 Finally, we had to give up our idea to hold a picnic outside as it rained for a whole afternoon. have to （考点） shall用于第一，三人称疑问句， 征求意见或请求

　　shall

　　第二，三人称　

　　　陈述句,命令,警告,允诺,威胁

　　should 表劝告，建议，命令，顺理成章的 　＝ought to

　　疑问句中常用should代替ought to ought to 表应该，语气＞should

　　美语中，ought to用于否，疑句时to 可省 shall , should &ought to Need I do …? Yes, you must.

　　No, you needn’t.

　　dare & need 情态动词 实义动词 dare 否，疑，条

　　dare not do 否,疑don’t dare to do

　　don’t dare do 不用于肯定句 肯：dare to do

　　need 否，疑

　　needn’t do

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