As per the subject-verb agreement, if a subject is singular, its verb must also be singular

He sings.

if a subject is plural, its verb must also be plural.

They sing.

I have seen some examples of "cut" on the internet that created some confusion.

  • Tom has cut his finger.
  • Tom often cuts classes. (Tom is singular - so cuts are used)
  • Tom cut classes again. (why is cut used here and not cuts. Tom is singular)
  • My mother cut the cake.

    (My mother is singular, then shouldn't we use cuts here)

  • This knife cuts well.

    (knife is also singular)

  • Each cone cuts out an area on the surface equally inclined to the cone axis.


Notice that the distinction you made applies to the third person of the present simple tense.

You have a mixed collection of different tenses in your examples:

  • Tom has cut his finger - PRESENT PERFECT tense - cut is the past particicle. The same past particle is used for all subjects

  • Tom often cuts classes - PRESENT SIMPLE tense

  • Tom cut classes again and My mother cut the cake - PAST SIMPLE tense - the same word is used for all subjects

Your two last examples are PRESENT SIMPLE tense too, cuts applies to both of them because they use the third singular person: it.

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