we looking forward to receiving your quotation.we look forwa

原句应为we are looking forward to receiving your quotation ,are looking forward to be looking forward to是现在进行时表将来 所以不能改为一般现在时 通常英语写信的话look forward to也用于现在进行时的 其实,就是现在进行时和一般现在时的差别.
i am looking forward to your reply 我正在盼望着你的答复
i look forward to your reply 我(经常或总是)盼望你的答复