roof is use what???

A roof is for covering an area.
A roof forms the top of a building.



Prepositions:

Peter is sitting on the roof.
彼得坐在屋頂上。

A bird is flying above the roof.
一隻鳥兒在屋頂上飛行。

Although Mary and John have divorced, they continue to live under the same roof.
雖然瑪莉和約翰已離婚，但他們仍住在同一所房子裡。



Hope these examples can help you.

All sorts of people found shelter (under) his roof. 在屋頂下

Sky windows will be installed (at) the roof level to introduce natural light.在屋頂那裡

Our water comes (from) the roof. We drink, cook, and clean with rain water.
來自屋頂


on the roof 在屋頂上

we usually say on a roof

SS：
A roof is used to cover a house (with) .加不加with也可以。
A roof is used for covering a house or other building.

use with or at