The verb 'could' is the past tense of the verb 'can'.
The verbs 'can' and 'could' are most often auxiliary (helping) verbs used to express possibility or ability to do something.
Examples:
We can bring some food for a picnic. (auxiliary verb)
Yes, we can. (verb)
I could dance all night when I was twenty. (auxiliary verb)
I never could. (verb)
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you should have the title of your paper then if necessary you could use a subtitle your name the due date and that's it thank you for reading this paper
Use it in a question... 'Could I have done better ?' - or - in a statement...'I could have done better.'
Plastic is pretty cool. You use it to make stuff, and print 3D printer stuff. Neat, huh? But also, plastic can get stuck on turtle's necks - that could kill them; which is bad, huh?
when you carrying a microscope you should use your hands
If they are kept sterile, then they should last until you use them.they should last until you use them.