Q:

Adjectives ending in -ed and -ing

After adjective ending in -ed like amazed, disgusted what preposition I have to put after? 
For example: I am bored OF/BY the maths test/my friend Luca. 
Are there any rules for this construction?

A:

There are no rules. Learn each expression in examples to help you remember the preposition. (bored with/by, interested in, etc.)
There is an explanation, however, for adjectives ending in -ed and -ing, as mentioned in the title of the post. An adjective ending in -ing describes what the noun is, so the lecture is boring,interesting, etc. An adjective ending in -ed is how you feel, so you feel bored with/by the lecture, or you're interested in the lecture, etc., but there are, of course, other suffixes for adjectives, such as -able, -ible,-ful, -ic, -ive, -less, and -ous, that may describe what something is, or how you feel. Examples help to learn these adjectives, and there are exceptions to almost every rule.

