I am slightly baffled by the following two sets of words. Can you de-baffle (?) please?

1. effort and efforts (his effort and his efforts)

2. my thought and my thoughts
Could you please elaborate on why it is they baffle you?
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I am baffled by the use of the 'subject" words.


That is my effort.

They are my efforts.

That is my thought.

They are my thoughts.

(How much effort or thought can a first order person can expend?)
I'm sorry, but I'm really not sure where your confusion lies. All that I can tell you is that "effort" and "thought" are singular, whereas "efforts" and "thoughts" are plural. A person can make more than one effort and have more than one thought.