Answer and Explanation:
A prepositional phrase is constituted by a preposition and its object (complement). We can easily find it in the sentence by finding the preposition.
Now, I know we are supposed to cross the prepositional phrases out as our first step, but since that format is not supported here, I will italicize them. Please, consider them as having been crossed out:
1. Gasoline from the broken fuel line dripped onto the floor of the garage.
2. Elephants often form lifelong bonds with members of their herd.
The next step is to find and underline the subject once. Remember, subjects are the topic of the sentence. Let's do this:
1. Gasoline dripped onto the floor of the garage.
2. Elephants often form lifelong bonds.
Finally, we must underline the verbs twice. Again, that format is not supported here, so I will highlight the verbs:
1. Gasoline dripped onto the floor of the garage.
2. Elephants often form lifelong bonds.