Hi, Rasha Assem,
I was surfing the net for information about compound adjectives, one of the topics that I haven't studied. I came across this site: https://www.englishgrammar101..../compound-adjectives. There I read the following:
1- The slowly moving train blocked the traffic.
2- The slow-moving train blocked the traffic.
‘Slowly’ is an adverb that modifies the verb, i.e. the train that was moving slowly (temporary case). ‘Slow moving’ is related to the train itself. It was slow. This is what your link (https://www.englishgrammar101..../compound-adjectives) is trying to explain. Unlike your link, I see that ‘slow’ in ‘slow-moving’ doesn’t have to be an adjective. It could be classified as ‘an adverb + a participle’. You can find a similar example in ‘Advanced Grammar in Use’, page ‘138’. It classifies ‘fast-growing’ as an adverb + -ing participle.
I don't understand the difference in meaning. Also, I don't know when to add an adverb to the participle to form a compound adjective and when to add an adjective to the participle to form a compound adjective.
I think the following part might help. It is from the ‘Cambridge Grammar of the English Language, page 1695:
Verbs like look, smell, taste, seem, etc., which take adjectival predicative complements, occur in compounds matching the clausal construction: a strange-looking object matches an object that looks strange, a desperate-seeming suggestion matches a suggestion that seems desperate, and so on. But good-looking and high-sounding are lexicalised – we can say, for example, Your prospects look good, but not ∗Your prospects are good-looking. With other kinds of verb there is also a good deal of lexicalisation, as in easy-going, far-seeing, long-suffering. Hard-working corresponds to work hard, with adverbial hard, but we need to distinguish between compound adjectives of this form
and adverb + verb syntactic sequences like rapidly diminishing ( returns). One difference is that we can say They seem hard-working, but not ∗They seem rapidly diminishing.