Forecast can be used as a verb or a noun.
Verb: Meteorologists forecast the weather.
Noun: Today's forecast looks gloomy.
part of speech
The part of speech for this particular word is a noun.
Preparation of the forecast. This is the analysis part of the process. After the model to be used is determined, the analysis can begin and the forecast can be prepared.
what part of speech is beneath
what part of speech is work
adverb
the part of speech sashay is a averb
Did is a verb, and not is an adverb. Didn't is not any part of speech. It's a contraction of did and not.
The word speech is a noun.
Adjective
No, but it's part of a noun which the noun is the part of speech.
Yes, conjunction is a part of speech.