～ては〜てはRepeating action, If, Since

Another structure making use of the combined て and は particles is ては～ては. This grammar pattern highlights that the actions of (A) and (B) are continuously being repeated and can be interpreted as 'doing (A) and (B) repeatedly'. The (A) and (B) actions will often be things that contrast each other in some respect, such as starting and stopping, walking and running, going forwards and then backwards, etc.

ては～ては will be used with verbs in the て-form, so will occasionally appear as では.

The abbreviated versions of ちゃ and じゃ may also be seen with the grammar point, but it may be considered unnatural if the same abbreviation is not used both times. This is mainly due to the level of formality being required to stay the same within sentences.

Caution

ては may sometimes appear only once, without any change to the meaning of repetition. This is usually when there is some indication in the rest of the sentence that the action is something that is being repeated over and over.