How do you form the subjunctive of an -er verb?

In order to find the subjunctive of an -er verb, you first have to know how to conjugate them in the indicative. So let's take the verb "aimer", to love. First, you have to find the ils (or third-person plural) version of that verb in the indicative, which in this case is "aiment". Then, you need to cut off the "ils" ending to find the stem. The ils ending is "-ent", so you're left with "aim-". Then you add the endings for the subjunctive present, as follows: j'aim - e// tu aim- es// il aim - e// nous aim - ions// vous aim - iez// ils aim - ent// Can you spot the difference between those forms and the indicative present? Remember, there are also lots of exceptions to this rule!