when doing sth 还是 when do sth (语法问题)这句话：we consider it as constant when computing the signal to noise ratio.还是we consider it as constant when compute the signal to noise ratio

when+doing 还是when+to do sth. be doing sth.when when are you doing sth?正确还是when are you do sth?正确?中文意思是“你什么时候做sth?” use sth doing sth还是use sth to do sth after do sth.还是after doing sth. promise doing sth还是to do sth mind doing sth还是 to do sth have somebody do sth 还是doing sth? finish to do sth还是doing sth why not do sth 还是doing sth enough doing sth 还是 to do sth before doing sth还是do sth never doing sth 还是do sth? expect to do sth还是doing sth? important do sth 还是,important doing sth got an invitation to do sth 还是 on doing sth/in doing sth/of doing sth plan+to do sth.还是doing sth.还是 do sth. 如何对be doing sth when造句