Найдите в следующих предложениях субъектный инфинитивный оборот («сложное подлежащее»).

Question

Найдите в следующих предложениях субъектный инфинитивный оборот («сложное подлежащее») . 
 
1. Investors proved to need accounting knowledge in order to understand financial statements. 
2. Judging by financial reports this business seems to be operating at a profit now. 
3. Very often the words and terms that mean one thing in accounting happen to have a completely different meaning in ordinary language usage. 
4. These resources appear to have been supplied to the firm by someone.

Сергей Васильев · Accepted Answer

1. Investors proved to need 
2. business seems to be operating 
3. words and terms happen to have 
4. resources appear to have been supplied