When to use which tense?

1 For actions happening regularly, often or never, we use ...................
2 For actions happening now, we use ..............
3 The verbs 'be', 'have', 'like' and 'want' are normally only used in ..............
4 The signal word 'usually' indicates that we have to use .
The signal word 'now' indicates that we have to use ................
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