Question

He _____(sail)for England next Monday

Answer 1

Answer:

will sail....... .. ..

Answer 2

This blank can be filled with the word 'will sail'

So, correct sentence will be:-

He will sail for England next Monday.

Will sail is used because the sentence is in future tense.

We can detect whether the sentence is in present, past or future be looking the sentence structure.

Here next Monday is used so it denotes the sentence is in future tense.

Hence, will sail is correct answer.