Becoming
"Encouraged" is the simple past and past participle of the verb "encourage".
choosing
The present participle of think is thinking. Present participles always end in -ing.
he or she barks or it barks present particle of bark
electrons are not present in the nucleus
Lying around.
If you mean subatomic particles, all of the standard ones are present.
Increased is the past tense of increase.
Present participle - doing. Past participle - done.
infinitive: become past: became past participle: become
(I, We, You, They) become. (He, She, It) becomes.
Fun isn't a verb, so it doesn't have a past or present participle.