The past tense of "mark" is "marked." When we're talking about the past, we use the past tense to indicate that something has already happened. So, if you wanted to talk about a previous action of marking something, you would use the word "marked."
Imagine you have a piece of paper and you put a big red "X" on it. In the present, you can say, "I mark the paper with a red X." But if you're talking about something you already did, you would say, "I marked the paper with a red X." The act of marking is in the past.
Remember, English verbs have different forms to indicate different tenses. The base form of the verb is used in the present tense, but when you're talking about something that already happened, you need to change it to the past tense. So, with "mark," we add the -ed ending to show that it occurred in the past.
Keep practicing your English, and soon you'll have a whole collection of past tense verbs at your disposal. Happy learning!
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