Question

we usually go to the bed at night .
spot the error​

Answer 1

it will be sleep instead of bed

Answer 2

Explanation:

There are two errors.

One, as has already been pointed out, the extra, unnecessary article ‘the’. ‘Go to bed’ is a phrasal verb form or an expression, a substitute for ‘go to sleep’, like ‘turn in’, ‘hit the bed/bunk/ sack/ hay’ etc. So, we cannot and must not insert any extra article or word within it.

Two, adverb ‘usually’. An adverb is a word that can be added to a sentence in order to make the sentence more forceful, versatile, or attractive. Here ‘usually’ is an undesirable element. ‘We usually go to bed at night’. Usually everyone goes to bed at night.

Usually, when we use usually in constructions like the one above, we specify a time.

We usually go to bed at nine (o’clock)