the line is to be opened to traffic on May Day.经常看到的~不明白为什么句子当中常常会出现"to be"这个词组,因为我觉得它好像在句子里没什么意思,只用is也就够了.哪个英语达人能解释下吗?:)

Find the equation of the line OP /> Vertical line test can be used to determine whether the graph of a relation is a funtion什么意思 英语翻译Why is it more efficient for the work cells to prepare “modules” and deliver them to the assembly line than it would be to produce the component(e.g.,interior upholstery) on the line? The line is engaged. 英语翻译The computation of straight-line depreciation may be simplified by converting the annual depreciation to a percentage of depreciable cost.The straight-line percentage is determined by dividing 100$ by the number of years of expected usefu be the last in line the problem solve itThe tangent line to a circle may be defined as the line that intersects the circle in a single point,called the point of tangency.If the equation if the circle is x^2 + y^2 = r^2 and the equation of the tangent line is y = mx + b, Tony ran enough fast to be the first one to cross the finish line.改错 The judge told him that he ____(be) the first to pass the finishing line I will be right with Patient:Doctor,doctor,I’ve only got 59 seconds to live!Doctor:Please wait a minute and I’ll be right with you.The doctor’s line in this joke is known as the punch-line .（the punch-line是指笑话里最经典的一句 上下文:Late every night the colours fade from the skyAnd the music is gone from the moonStanding in line for what used to be mineWhat use is the rhyme with no tuneStanding in line for what used to be mine.请问这问如何翻译,另外请问in li here is the bottom line is still on the line. This Is The Line 歌词 be the first to cross the finish line是什么意思?问题补充： 英语翻译There is one error:The declaration of c in line 6 conflicts with the function parameter c.Some compilers have been seen to flag line 24 as an error,saying it conflicts with the declaration in line 20.This should not be an error,as the sco a figure that can be folded over along a straight line so that the result is two equal halves which are then lying on top of one another with no overlap is said to have a line of symmetry.which of the following figures has only one line of symmetry?A 英语翻译The gate width and delay step size is set in the next line.Gate widths from 1 us to 10 ms may beset in a 1,2,5 sequence.The gate start position is set in the last line of the scan menu.The start position may be set from 1to 50,000 gate wi