Formation of Time clauses

Can some one please tell me whether there is a kind of written form for time clauses??? Or maybe a particular way to structure them??

Thanks

[RonBee]

Try this:

http://www.google.com/search?hl=en&q...=Google+Search

The English Zone site seems to be especially useful. Go to:

www.english-zone.com/grammar/cls-pres1.html

Also, try:

http://english.baladre.org/sedaviweb...imeclause1.htm

Let me know if that helps.