-ing form with preparatory it

Hi, Hussein,

This is indeed a very interesting topic.

To put it briefly, the possibility (or impossibility) to use a gerund in extraposition (anticipated by "it") has to do with the type of adjective, as you can see in this old thread.

While "advisable" belongs to the group of more objective adjectives that don't allow for the use of an extraposed gerund (necessary, urgent, vital, important, essential), "amazing" and "interesting" are more subjective in nature, being similar to pleasant, nice, strange, tough, difficult, and thus allow for a gerund after them.

Needless to say, more "emotional" adjectives accept the informality you mention of placing the gerund in extraposition, while more "rational" ones preclude that possibility as they tend to be more formal.

Thank you so much, Gustavo for your reply and the link you've provided, but I still need some further information about the difference between: 

A. Objective/emotional adjectives

B. Subjective/rational adjectives

I've never heard nor read about that before. 

Thanks in advance.

Hussein Hassan posted:

A. Objective/emotional adjectives

B. Subjective/rational adjectives

 

I think you've mixed them up. I'd say:

A. objective/rational adjectives
B. subjective/emotional adjectives

Group A adjectives are more formal, while group B adjectives are more informal and thus allow for this pattern you mentioned in your initial post:

'it' can be used as a preparatory subject or object for an -ing form, especially in informal style. We often use it with adjectives.

I don't think you will find a definition of group A and group B adjectives in a book, but I'm sure you can see the difference between:

A. It was important to see her. (NOT seeing her)
B. It was nice to see/seeing her.

While "important" defines or describes what it was like to see her, "nice" expresses what the speaker feels (or felt) after (or when) seeing her.

I'm sure you can see the difference between:

A. It was important to see her. (NOT seeing her)
B. It was nice to see/seeing her.

While "important" defines or describes what it was like to see her, "nice" expresses what the speaker feels (or felt) after (or when) seeing her.

Thanks a lot, Gustavo. You made it clear.