'Would you like this candy or these desserts to follow the meal?'This is being used as an indicator for a singular item, and these is being used as an indicator for multiple items.See the related...
If it's a word it can be used in a sentence. Otherwise it wouldn't be a word.-__-
I have decided to clean out my garage next week. - as a verb we are having a clean out at home on the weekend. - as a noun
Example sentence - I heated the water in the kettle to make tea.
When I prepare to write a speech, the idea summary will be found in the topic sentence.