Question

he was heavy so he could not run fast(join using an adverb clause)
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Answer 1

Answer:

As he was heavy he couldn't run fast.

Explanation:

hope it helps

Answer 2

Answer:

1)He was too heavy to run fast

or

2)He was so heavy that he cannot run fast

If the adverb too is followed by an adjective + to infinitive, we expand the sentence into two clauses

First example is better answer