彼がどれだけ速く走るかに驚くよ

Meaning
it amazes me how fast he runs

Vocab used in this sentence

he, his, him, boyfriend
is, there, but, ga, will, however
どれ
how, what, which, which one, where
だけ
only, just, much, alone, merely, simply
速い
fast, quick, fast-paced, swift, rapid
走る
run, race, dash, sprint
or, ka
in, to, on, at, into, upon
驚く
surprising, surprised, amazed, be amazed
the, yo, ll

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