Which strategy that you can use to find the subject of a sentence?

Find the verb and then find the noun which is activating the verb.

Simplest form: 'The dog bites the man' . . here the verb is 'bites' and the noun activating the verb is 'dog', in other Words the dog is doing the biting, and the dog is placed before the verb.

In English Word order is usually the major factor that determines the grammar, and the subject is normally before the verb, as it is in the example. So a useful method is to find the verb and then look at the nouns before the verb.