No, it is not correct grammatically. The correct phrasing would be "Should I take these?" or "Should I take these ones?"
this one --> these ones (or merely these). seems fine to me.
No, it is not incorrect. You could say, "These ones are the best for baking."
No, it is not correct to say "those ones." "Those" is already a plural determiner, so there is no need to add "ones" after it. Just saying "those" is sufficient: "I like those books."
No, "ones" is not correct when referring to an individual person. "Ones" typically refers to a group or category of things. To refer to an individual in the singular form, you would say "one is."
Yes, it is correct to say "take a course" when referring to enrolling in and participating in an educational class or program.
this one --> these ones (or merely these). seems fine to me.
No, it is not incorrect. You could say, "These ones are the best for baking."
No, it is not correct to say "those ones." "Those" is already a plural determiner, so there is no need to add "ones" after it. Just saying "those" is sufficient: "I like those books."
No, "ones" is not correct when referring to an individual person. "Ones" typically refers to a group or category of things. To refer to an individual in the singular form, you would say "one is."
Nope. It should be "He should have..."
Yes
No, the correct way to say that would be... "You should just go to work"
You should say for your convenience it is *gramatically correct-*just means correct
"One" can be a pronoun, but I think I would use "those" in this instance, too.
Yes, it is correct to say "take a course" when referring to enrolling in and participating in an educational class or program.
The correct form should be 'neatest.'
'Those ones' is redundant, and it has a very unsophisticated, uneducated sound. Not that we should worship sophistication. You would do better to avoid 'those ones' or 'these ones' unless you are just talking casually with friends.