Hello, neltruth—and welcome to English Forums. 'Thus' is not a word much used by native speakers; thus, it usually sounds rather stilted in such as your example. He considers himself a helpful person , so he always tries to help people.
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neltruthI though "so" would be a little informal for writing, isn't it?No. But your whole sentence is informal; that is why 'thus' stands out like a sore thumb: 'thus' is very formal.
neltruth If you could show me, please.Have a look at my own 'thus' sentence in my first post.