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时态判别1.We know he ____ (visit) his friend at present.2.____ (

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时态判别
1.We know he ____ (visit) his friend at present.
2.____ (see) is ____ (believe).
请问如何判别两句时态
时态判别1.We know he ____ (visit) his friend at present.2.____ (
1,is visiting 后面有表示现在时的词.
2,seeing is believing这一句跟时态没什么大关系,第一个是现在分词作主语,第二个是现在分词作表语.