Grammar Step 1 A Using may for possibility 1 If we do nothing soon there may be none left may 表示猜測 可能性 用于肯定句中或否定句中 2 The bamboo forests are becoming smaller and smaller As a result pandas may not have a place to live or food to eat may not do 意為 可能不 Step 2 Exercises In the zoo 1 The elephant is going towards the water It need a bath 2 A little boy is crying when he sees the tigers He be afraid of them 3 I cannot go near the lions and tigers They hurt me 4 The baby panda is staying near its mother It be drinking milk 5 The monkeys are jumping around They be playing with each other 6 The horse is standing with its eyes closed It be sleeping Step 3 B Using verbs to infinitives 1 在英語中某些及物動詞后接動詞不定式作賓語 常用的此類動詞有 agree to do sth 同意干 begin to do sth 開始干 decide to do sth 決定干 fail to do sth 做某事失敗 forget to do sth 忘記干 hope to do sth 希望干 learn to do sth 學(xué)著干 plan to do sth 計(jì)劃干 prepare to do sth 準(zhǔn)備干 remember to do 記得干 try to do sth 嘗試干 want to do 想要干 2 to do 做賓語補(bǔ)足語 ask sb to do tell sb to do invite sb to do want sb to do would like sb to do teach sb to do advise sb to do 但有的動詞后跟不帶 to 的不定式作賓補(bǔ) 如 hear sb do see sb do watch sb do make sb do let sb do help sb do We don t use to after these verbs 1 enjoy Kitty enjoys dancing 2 let The teacher lets him read loudly 3 practise You should practise speaking often 4 make The joke makes me laugh and laugh 5 help She often helps me to carry water 6 finish You must finish doing your homework on