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 <em>from the broken fuel line </em>dripped onto the floor of the garage.
2. Elephants often form lifelong bonds <em>with members of their herd</em>.
The next step is to find and underline the subject once. Remember, subjects are the topic of the sentence. Let's do this:
1. <u>Gasoline</u> dripped onto the floor of the garage.
2. <u>Elephants</u> 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. <u>Gasoline</u> dripped onto the floor of the garage.
2. <u>Elephants</u> often form lifelong bonds.