When do you use

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When do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you use
When do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you useWhen do you use