If you curtail something, you reduce or limit it.
The government plans to curtail the number of troops being sent overseas.
He had to curtail his anger
Smoking cigarettes will curtail a persons life expectancy.
It can be revived at any moment and used to curtail free speech.
We will have to curtail our spending so the funding will last to the end of the year.
We must curtail our trip because it has become to expensive.
Curtail is a verb meaning to limit, shorten or reduce i.e. In order to lose weight, one must curtail their food intake.
He decided to curtail his spending in order to save money for a vacation.
The verb in this sentence is the word "is." When you use the verb "to be," you must use the correct form of it.
Herb is a noun not a verb.
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The complete verb in the sentence is "should use."
no you need a verb and a noun