The term 'แทน (thæn)' is commonly used in Thai language to express the idea of 'instead of' or substitution. It is typically used in the form of 'แทนที่...จะ...' (thæn thi...ja...) to indicate that one action or thing is a substitute for another action or thing. Less commonly, it can also be used without 'จะ' (ja) to emphasize the contrast between the two actions or things. In these cases, it is always placed at the beginning of the sentence.