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Than can be used as a conjunction and as a preposition in English.

We often use it to compare things.

For example: "Laika is smaller than Sam."

For example: "When I looked at my money, I had less than I thought I had."

Then can be used as an adjective or an adverb. It is used to describe time in the past or the future.

For example: "They say machines will do all the work in the future, but I think I'll be retired by then."

If you still get them confused think "When = Then".

For Gvozden