... features such as auxiliary verbs”, Modal verb have more defects lack some unique characteristics as follows : - No “TO” in prototypes and when verb follows And modal verbs are used together with ... Procedures All the auxiliary verbs except be, and have are called modals Unlike other auxiliary verbs modals only exist in their helping form; they cannot act alone as the main verb in a sentence Be, ... also serve as ordinary verbs in a given sentence The modal verbs are: CAN, COULD, MAY, MIGHT, MUST, SHALL, SHOULD, OUGHT TO, WILL, WOULD http://www.learnenglish.de/grammar/verbmodal.htm (Please check...