摘要: 现在进行时的结构:主语+be+Ving. (be动词和动词+ing两者缺一不可) 考题形式:(1) 已知be动词.考后面的动词形式, (2) 已知后面的动词+ing, 则前面用be动词. 如:(1) The boy is (run) with his father. (2) Some children are (lie) on the grass. (3) My brother and I are soccer. (4) His sister is a book.

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