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I love you too.

Jack tells Jill, ‘I love you too’. He could mean any one of several things, (a) that just as Jill loves him, so he loves her, (b) that he loves Jill and someone else too, (c) that like someone else, he too loves Jill, or (d) that he has love as well as some other feeling for Jill.

Kent Bach: Semantic nonspecificity and mixed quantifiers