---------Using the wrong preposition--------

Accustomed to, not with.

！Don't say: I'm accustomed with hot weather.

√ Say: I'm accustomed to hot weather.

Note: Also used to: He is used to the heat.

------------Using the wrong preposition----------

Travel by train, etc., not with the train, etc.

！Don't say: He/She traveled with the train yesterday.

√ Say: He/She traveled by train yesterday.

Note: We say by train, by boat, by plane, by bike; also, by land, by sea, by air, by bus; on a bus or in a bus; by car or in a car, by taxi or in a taxi; on a horseback, on a donkey, on a bicycle; on foot.

*The next question is: Is it travelled or traveled?*