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Tip 1: make it clear the character is going back in time.

Give the character a trigger – he sees an object, smells a scent, or experiences an action.

For stories written in past tense, use past perfect tense a few times when entering the flashback. Once in, switch to past tense until near the end of the flashback, then switch to past perfect a few times. After leaving the flashback, return to past tense. (Limits cumbersome past perfect.)

For stories written in present tense, use the simple past in the flashback.

Tip 2: Write the flashback so it:

*Serves a purpose – shows what shaped characters into who they are now or shows past story world.
*Engages the reader.

*Is limited to key moments.

Tip 3: Write ending sentences that transition the reader and character from the flashback.

*Use another trigger – abrupt or easing.

*Change verb tense…