Can I use the verb 'love' this way? I mean can 'love' be intransitive verb?
1- I love that he is a very nice person.
The sentence is correct. What you are missing here is that the verb love here is not being used as intransitive. It is still transitive - the object is the dependent sentence (that he is a very nice person) that follows.
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The sentence is correct. What you are missing here is that the verb love here is not being used as intransitive. It is still transitive - the object is the dependent sentence (that he is a very nice person) that follows.
As a side note, when you are wondering how you can combine words, you can also consult a collocations dictionary like the one I share here: