Learn Arabic (Modern Standard): وقف الأسد أمام شجرة.

In Arabic, sentences often start with the verb. This is called a verbal sentence. So, instead of using the English word order "The lion stood," you say "Stood the lion" (وقف الأسد).

Since we are learning the dual suffix, how would I say "The two lions stood"?

You would add the dual suffix ـان to the subject, making it الأسدان (the two lions). Importantly, the verb stays singular! In Arabic, when the verb comes before the subject, it always stays singular even if the subject is dual or plural. So the sentence is simply وقف الأسدان.

What if I wanted to say "in front of two trees"? Do I add ـان or ـين to the tree?

You would use ـين and say أمام شجرتين. We use the ـين ending (instead of ـان) when the word comes right after a preposition or a location word like أمام (in front of). Also, notice that the curly taa marbuutah (ة) at the end of شجرة opens up into a regular ت before you attach the suffix!

Is the location word أمام (in front of) related to the title "Imam"?

Yes! Both words come from the same Arabic root meaning "to lead" or "to be at the front." An Imam (إمام) is literally the person who stands in front of the congregation to lead the prayer.