1) They always fight with each other.
2) They are always fighting with each other.
Always + fight = 每次见到都会打。
Be always + fighting = 经常打架，但不是每一次都会打起来。
The two guys always fight with each other.
最地道：They always fight.
They always fight with each other.
The both always quarrel with each - other .
They are fighting all the time ./They always fighting .
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