Last year’s clothes are too small for me now.
could + verb
I threw my old clothes away yesterday.
could + have + past participle
More machines pull and twist the rope until it’s thin.
The rope is pulled and twisted until it’s thin.
These machines work the cotton into a kind of soft, untwisted rope.
The cotton is worked into a kind of soft, untwisted rope.
How does this outfit look for the party?
should/shouldn't + verb
My green necklace broke, so I threw it away.
could + have + past participle
I don't know what to do with my old clothes
could + verb
Workers pick the cotton from the fields.
The cotton is picked from the fields.
People ship the cotton to textile mills.
The cotton is shipped to textile mills.
I’m going to dye this white shirt a nice bright red.
should/shouldn't + verb
I've bought four T-shirts and got another one for free!
should/shouldn't + have + past participle
Machines remove the seeds from the cotton.
Seeds are removed from the cotton.
I ordered these shoes online but they don't fit.
should/shouldn't + have + past participle
People use special machines to separate the fibres.
Special machines are used to separate the fibres.
Textile machines clean the cotton and separate it into smaller pieces.
The cotton is cleaned and it’s separated into smaller pieces.
Machines twist the fibres to make cotton thread.
The fibres are twisted to make cotton thread.