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1.The two girls ___ (stop) talking when they saw me

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1.The two girls ___ (stop) talking when they saw me
2.What did you see,Susan?
I saw many people __(plant) trees on the hill
1.stopped.
reason:首先分析时态,由于其后从句中的动词为saw,即see的过去式,所以可知时态为过去时.其次分析句子结构.the two girls + verb为主句,when whey saw me 为时间状语从句,现已知动词的时态,动词的形式由支配动词的主语数量决定.由于数量为2 girls,所以动词形式为复数,所以由此可知答案为stopped.注意双写p.
2.planting
同样为复合句.主句成分i saw many people.从句修饰people状态,再次动词plant不做动词,而是动名词.动词名次话,也即是verb+ing形式.所以为planting.