Tiuj ĉi estas la plej grandaj arboj en la arbaro = These are the largest trees in the wood.
And always, when the weather is sub la arboj vespere kaj ĝuas very hot, they sit under their la freŝecon.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "arboj" in a variety of sentences. We hope that you will now be able to make sentences using this word.