Grammar and Punctuation The Blue Book of Grammar and Punctuation

In, Into

Use in for where something is: its location or position. I am in my car.

Use into for where something is going: its direction or destination. I am driving into a tunnel.

Idiomatic exception: Go jump in the lake. Strict grammar requires into, but that is a losing battle.

Please see our post Into vs. In to, which provides more discussion and helpful examples.

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