for

　　(1)介詞,表示"當(dāng)作,作為".

　　I ate eggs and bread for lunch.

　　What do you have for breakfast?

　　(2)表示理由或原因,意為"因為,由于".

　　I didn't go to school today, for it was cold.

　　Thank you for talking to us.

　　(3)表示去向,目的,意為"向,往,取,買"等.

　　What did you come here for?

　　We go out for a walk every evening.

　　(4)表示動作的對象或接受者,意為"給…","對…而言".

　　My mother bought a book for me.

　　Reading in the sun is bad for your eyes.

　　(5)表示時間,距離,意為"達(dá),計".

　　I stayed in Beijing for 2 months.

　　It's bad ____ you to watch TV.

　　A as B for C of D in

　　talk

　　作動詞,意為"談話",構(gòu)成詞組

　　talk with/to sb與某人談話.

　　talk about sth談?wù)撃呈?/p>

　　Who is your teacher talking with?

　　We are talking about English food.

　　Lucy is talking ____ her mother.

　　A for B to C about D at

　　need

　　作實義動詞,意為"需要,必要"之意.

　　(1)need sth 需要某物.

　　I need a bag.

　　Do you need help?

　　We need a lot of food.

　　(2)need to do sth

　　We need to go to school every day.

　　He needs to stay at home by himself.

　　(3)need doing sth

　　My clothes need washing.

　　His bike needs repairing.

　　(4)need 還可作名詞,意為"需要,需求,必要".

　　There's no need to stay here.

　　(5)need還可作情態(tài)動詞,多用于疑問句和否定句中,此時后面加動詞原形,need引導(dǎo)的一般疑問句,其答語肯定用must,否定用needn't.

　　I needn't go to school today.

　　Need you finish your homework before six o'clock?

　　-Need I go now? -Yes, you ______.

　　A need B must C can D may

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