Minimalist's answer: Two. Common answer: twelve 3 simple 3 simple progressive 3 perfect 3 perfect progressive Maximalists add the passive constructions (12 more) and possibly modals / modal perfect.
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Minimalist's answer: Two.
Common answer: twelve
3 simple
3 simple progressive
3 perfect
3 perfect progressive
Maximalists add the passive constructions (12 more) and possibly modals / modal perfect.