I red somewhere that "see" doesn't form present participle. Is it true? For exemple in sentence:
- I'm seeing my doctor today.
We use -ing form. Can we call it present participle in sentence or should we call it differently?
Your example used "seeing" as a present continuous to indicate immediate future. It is NOT used as a participle.
A participle is a verb form used as an adjective.
a seeing-eye dog
the all-seeing God
But, we say a sighted person (meaning not blind), rather than a seeing person. Perhaps that's what your friend meant.
No, that is not true. Almost all verbs can be formed into an -ing form. Seeing is perfectly acceptable.
The main exceptions are the helping verbs, such as can, could, will, would, ought, may, might, shall, and should, and the defective verb beware, which itself can only be used in imperative and infinitive forms.