Question

Convert compound sentence to simple sentence:
You must run fast, otherwise, you cannot catch the train.

• A. You must run fast in order to catch the train.
• B. You need to run fast if you want to catch the train.
• C. To catch the train you must run fast.
• D. If you want to catch the train you should run fast.

Answer 1

The correct option is A You must run fast in order to catch the train.

Compound sentences can be transformed into simple sentences by changing first clause into a participial phrase. Here "you..train" is changed to "in...train". Hence, Option A is correct. The rest of the options do not fit the description, hence incorrect.