31. What happens to the grass when it is sending to the factory.

The correct sentence should be:

What happens to the grass when it is sent to the factory?

The verb "send" needs to be in the past participle form, "sent," to form the present perfect continuous tense.

32. This kind of jacket is considered to be very fashion these day.

The correct sentence should be:

This kind of jacket is considered to be very fashionable these days.

The adjective "fashion" needs to be changed to its adverb form, "fashionable," to describe the degree to which the jacket is considered fashionable.