that在宾语从句和定语从句里的【区别】
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宾语从句中,跟在动词后的that可省略,且无实意,如I think (that) you are right.

而定语从句中,that代替先行词在句中作成分,that只有作宾语时可省略,如The gift (that) you sent to me is beautiful.,作主语时不可省略,如I know the man that is stangding there.