To determine where to add -s to verbs, it's important to understand the basic rule: in the simple present tense, the verb takes an -s suffix when the subject is a singular third-person noun or pronoun (he, she, it). Let's analyze each sentence:
Sentence (a): 'A tortoise lives near the lake. It love sunny days.'
The subject 'It' refers to a singular third-person pronoun. Therefore, the verb should be 'loves' to agree with the singular subject. The corrected sentence is:
A tortoise lives near the lake. It loves sunny days.
Sentence (b): 'One day she see a rabbit. It run very fast.'
In this sentence, 'she' is singular and third-person, so the verb should be 'sees.' 'It' refers to the rabbit, which is also singular third-person, making the verb form 'runs.' The corrected sentence is:
One day she sees a rabbit. It runs very fast.
Sentence (c): 'She want to race with the rabbit, but she wonder if she can win.'
Here, 'she' is singular and third-person, so both verbs should change to 'wants' and 'wonders.' The corrected sentence is:
She wants to race with the rabbit, but she wonders if she can win.
Overall, remember that in the simple present tense with singular third-person subjects, verbs typically take an -s at the end.