如果是过去式,是just did 还是 just do sth

tell sb do sth如果是过去式的话,do要不要变成did 如果一句句子中出现just now ,那么是过去式还是现在完成时 DO .IS ...过去式是Did.was.还是Did.is.? DO .IS ...过去式是Did...was...还是Did...is... Just do it是 JUST NOW是跟现在完成时连用还是跟过去式连用? make sb.do sth的过去式是不是 made sb did sth?还是made sb do sth I would just as soon Tom did it.这里为什么是did不是do do sth.just now 与have just done sth. 怀特先生刚刚开始学中文,翻译成英语,是用just的现在完成时还是just now的过去式?为什么? 英语,如果我做过某事..如果句子中有have..是应该说:have did sth还是had do sth?应该用哪个 you should do sth是过去式吗