Question

这四个句子中的不定式to do都是做什么成分？表目的状语？做定语？做宾补？请教各位大神，谢谢您了~

1.However, we have several reasons to suspect that the story of the burning mirror is just a myth and the Greeks of Syracuse never really built such a device.
2.Second, the burning mirror would have taken a long time to set the ships on fire.
3.a device concentrating the Sun's rays on a wooden object 30 meters away took ten minutes to set the object on fire
4.So the Greeks had no reason to build a weapon like a burning mirror.
1.to suspect
2.to set
3.to set
4.to build

Answer 1

to do是动词不定式，在句子中可以作：主、宾、宾补、表、定、状。也就是说：除了不能作谓语之外，可以作各种成分。