Present simple
Habits, facts, and how things usually are. To say no or ask, add do or does: I don't catch up on, he doesn't catch up on.
- I / you / we / they catch up on
- he / she / it catches up on
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Irregular verb, phrasal verb.
Phrasal verb: up on
Only catch changes; up on stays the same: caught up on, caught up on.
Object in the middle
The object can go before up on, as the card writes it: catch someone up on. A pronoun always does: catch them up on.
In speech, the helping verbs shorten: I’m, he’s, we’re, I’ve, I’ll, I’d.
Enough to talk about now, the past, and your plans, and to give instructions.
Habits, facts, and how things usually are. To say no or ask, add do or does: I don't catch up on, he doesn't catch up on.
What is happening now, and plans already arranged: we’re leaving tomorrow.
A finished action at a past time: yesterday, in 2020. To say no or ask, add did: I didn't catch up on.
Plans and intentions, and what you can see coming: it’s going to rain.
Orders, advice, and instructions. Let’s suggests doing it together. To say no: don't catch up on.