If we follow that logic then with "He is going to the shop", does "going to the shop" become an adjective phrase? It describes/gives information about the the man after all. I would normally think of it as a verb phrase.
I see your point. I think to a large extent we use
all language to describe life as we see it. Classing everything an adjective wouldn't be useful. Adjectives modify nouns directly, I will try to remember.
Granted here I am adding complements/objects as the case may be, but I think the logic remains the same. I think that if we start telling students that the present continuous is actually an adjective then we run into all sorts of problems.
I think the argument becomes clear if you compare a simple verb with the present continuous.
He walks.
He is walking.
In English we use these examples to mean different things, e.g. habits, and current action. Verbs give us information about the action of an object. We can see that "walks" and "is walking" have similar properties. But what is "walking" bringing to the party? I talked about substitution before,
He is my boss (noun phrase)
He is a bore (noun phrase)
He is boring (adjective)
He is boring me to death (verb phrase)
Boring is being used in two different ways. The first describes a characteristic, whereas in the second case it's an action. Actions that describe nouns are classed as verbs.
Also, if we substitute "tall" for "my boss" does it suddenly become a noun? Or in the last example, does it become a verb? I suspect you need reversiblity to prove the point, as you tried to point out earlier. The "my boss" man, the "boring me to death" man doesn't work. But, the "tall" man, and the "boring" man does. In each case, they retain their semantic values. However, that's not true of "singing". What does this tell us, if anything?
I really see no problem with differentiating the usages of "ing". They may be the same "structurally" but that does not make the same thing.
I agree.
I will try another usage of "ing". "Wanting to go home, I said goodbye and left". Here the "wanting" is used to give a REASON for the following actions. Adjectives, or those that come to mind, never fulfill this function.
You're right. It's an adverb.
If I use "wanting" as an adjective as in the sentence "His is wanting in his language abilites", it has a completley different meaning.
Wanting as an adjective means lacking, or he still has much work to do.
Or in a slightly unusual use " He is wanting to catch the bus so he must rush away". I will not look up the use of wanting as an adjective placed before a noun because I don't have the time right now, but I guess that "A wanting man" is considered incorrect.
I think "he is wanting to X" is poor English, but "A wanting man" is only obscure English.
Okay, that's enough for now.
Iain