I was looking for the meaning of "cast" and I came across these examples from the Cambridge Dictionary:

to send light or shadow (= an area of darkness) in a particular direction:
• The moon cast a white light into the room.
• The tree cast a shadow over/on his face.
• (figurative)Her arrival cast a shadow over/on the party (= made it less pleasant). https://www.google.com/amp/s/dictionary.cambridge.org/amp/english/cast

Why for the 3 cases above we don't add an "s" to the verb after the singular nouns?

  • 1
    The principle parts of that verb are cast, cast and cast. The subject/verb agreement that you're looking for only exists in the present tense. There is no casted or casten, such as you might find with a more regular verb. Jan 19 at 6:08
  • Because they are past tense clauses, and "cast" is the past tense form of the verb "cast".
    – BillJ
    Jan 19 at 8:02

These three sentences are in past simple tense. Cast is one of about 10 verbs which have the same form for present simple, past simple and past participle (the most common are put and hit). If these sentences were present simple, we would use -s:

The moon casts a white light into the room (every night) > The moon cast a white light into the room (last night).

Compare shine/shone (or shined):

The moon shines a white light into the room (every night) > The moon shone (or shined) a white light into the room (last night).

(Shone is more common, but you might know shined.)

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