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id Let’s talk have a class yesterday afternoon They a class yesterday afternoon. were have ing hav write a letter when her mother came home Let’s talk boat at ten o’clock yesterday Let’s talk ride a bike at five o’clock yesterday Let’s talk swim at this time yesterday Let’s talk read a book yesterday afternoon Let’s talk play football at five o’clock yesterday afternoon Let’s talk at 5 o’clock yesterday afternoon dance Let’s talk fish at 5 o’clock yesterday afternoon Let’s talk : : : 表示在過去某一時刻正在進行的動作。 教學(xué)難點 :區(qū)別在 when 與 while引導(dǎo)的句子中過去進行時的