이 문장들에서 가목적어 it이 사용된거라고 생각했는데... 맞나요?

1. but somehow the indian gentleman found it necessary to shade his eyes with his hand and look down at the carpet.
2. i know what it is to be hungry, and it is very hard when one cannot even pretend it away.
3. i saw it when she sat down.
4. mr. barrow was a shrewd businessman, and felt it as well to make his own freedom from responsibility quite clear without any delay.