In a grammar book I find this question:
Find the mistake
The car run faster than I thought.
Does this sentence have a grammar mistake? I guess not.
Edit: I thought "run" is in the simple past tense so I could not find any mistake in the verb.
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The issue is with the verb, "run."
Since "car" is singular, the verb should be "runs." If we had a plural subject, then we'd say "run."
The car runs faster than I thought.
The cars run faster than I thought.
Note, though, that we can also say "run" with a singular, first person subject:
"Faster than I thought" is perfectly acceptable English, though.