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WintersummerSpringAutumn

1. Present
Present Simple: I walk 
Present Continuous: I am walking
Present Perfect: I have walked 
Present Perfect Continuous: I have been walking 
2. Past
Past Simple: I walked 
Past Continuous: I was walking 
Past Perfect: I had walked 
Past Perfect Continuous: I had been walking 
3. Future
Future Simple: I will walk 
Future Continuous: I will be walking
Future Perfect: I will have walked 
Future Perfect Continuous: I will have been walking