In Modal verbs^x, Tenses^x, Negatives^x

If we follow Swann, we can use need as a modal verb in an affirmative sentence when a 'non-affirmative' word (such as only, hardly, seldom etc.) gives the sentence a negative kind of meaning. Look at Swann's last example: the sentence becomes incorrect when only is removed. That...

Hmm...But why can't I use "any longer" in this case or it's using only in negative way ? And how I understand it's impossible to use can with future tenses and it's implied that "can" relate to present and future, isn't it? If I say : "How can I work hereafter?" Will it be correct?

What's the past of "could" Aarrgghh! could is a past form already! There are two series of forms to consider with modals. The interactions and combinations are the subject of entire books. So, in a way, a modal like may has "two pasts": might and may have . To make things even more...

Hello all, I am applying to take a CELTA course and they gave me an application task to do before I can enter the program. I am having some difficulty with some parts and was wondering if some one would be willing to help me. I use msn messanger under hpainter24@hotmail.com feel free to add...