Identify the use of the introductory comma in the sentence. waiting for the wave, jim didn't notice he was drifting.

Well to understand this better, let us determine what is most closely referred here about the clause “waiting for the wave”.

From reading the sentence we can see that since Jim was waiting for the wave he didn’t notice something was happening to him. So there is a connection between the clause and the verb. So this an adverb clause.

adverb clause

free time is when all my homework and chores have been done for the day and i am "free" to do things that i enjoy doing.

usually i spend time watching television. as my favorite tv shows come on at specific times, i make sure that i finish my homework and chores well before the shows. otherwise i will have to miss them. mostly i manage to watch the shows but sometimes extra homework or chores may cause me to miss a show or two, but it is rare. anyhow if i know that i am definitely not able to catch a show in time, i will just set the video recorder to tape the show sothe evening when the weather is fine, i sometimes go for a stroll around the neighborhood with my friends. this is the time when most the neighbors have come home from work or school. we say hello to those whom we know. they are mostly friendly people and they acknowledge our greetings. once in a while we come upon unfriendly neighbors but we just ignore them and carry on. that i can watch it later.