• Subject-Verb Agreement (Collective Nouns)
The word "Cattle" is a collective noun that is always treated as plural. Even though it doesn't end in 's', you must use a plural verb.
Incorrect: Cattle is...
Correct: Cattle are...
2. Tense Consistency
The second half of the sentence uses the word "attacked", which is in the past tense. To make the sentence logical, the first part should also reflect a past action (Past Continuous).
Incorrect: ...is grazing... when the tiger attacked.
Correct: ...was grazing... when the tiger attacked (if referring to one animal) or were grazing (for cattle).
