Conjugation

Brush up on

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Regular verb, phrasal verb.

  • Phrasal verb: up on

    Only brush changes; up on stays the same: brushed up on, brushed up on.

In speech, the helping verbs shorten: I’m, he’s, we’re, I’ve, I’ll, I’d.

Newbie

Enough to talk about now, the past, and your plans, and to give instructions.

  1. Present simple

    Habits, facts, and how things usually are. To say no or ask, add do or does: I don't brush up on, he doesn't brush up on.

    1. I / you / we / they brush up on
    2. he / she / it brushes up on

  2. Present continuous

    What is happening now, and plans already arranged: we’re leaving tomorrow.

    1. I am brushing up on
    2. you / we / they are brushing up on
    3. he / she / it is brushing up on

  3. Past simple

    A finished action at a past time: yesterday, in 2020. To say no or ask, add did: I didn't brush up on.

    1. I / you / he / she / it / we / they brushed up on

  4. Future with going to

    Plans and intentions, and what you can see coming: it’s going to rain.

    1. I am going to brush up on
    2. you / we / they are going to brush up on
    3. he / she / it is going to brush up on

  5. Imperative

    Orders, advice, and instructions. Let’s suggests doing it together. To say no: don't brush up on.

    1. (you) brush up on
    2. let's brush up on