Conjugation

Stumble upon

tomber sur

Regular verb, phrasal verb.

  • Phrasal verb: upon

    Only stumble changes; upon stays the same: stumbled upon, stumbled upon.

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 stumble upon, he doesn't stumble upon.

    1. I / you / we / they stumble upon
    2. he / she / it stumbles upon

  2. Present continuous

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

    1. I am stumbling upon
    2. you / we / they are stumbling upon
    3. he / she / it is stumbling upon

  3. Past simple

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

    1. I / you / he / she / it / we / they stumbled upon

  4. Future with going to

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

    1. I am going to stumble upon
    2. you / we / they are going to stumble upon
    3. he / she / it is going to stumble upon

  5. Imperative

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

    1. (you) stumble upon
    2. let's stumble upon