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riding a bike. Write, write, writing a letter, writing a letter. Swim, swim, swimming in the lake, swimming in the lake. Run, run, running on the grass, running on the grass. Tom play football. is ing Lucy is read a book. ing 主語 + be (am/is/are) +動詞 ing Look, I read a book am ing You run are ning. now. They watch TV are ing Look! The twins think are ing. now. 現(xiàn)在進(jìn)行時態(tài) 表示 正在進(jìn)行 的動作或事情。 now, look, listen… 其構(gòu)成形式是 主語 + be (am/is/are) +動詞 ing What is he doing?