Auxiliary Verbs

Auxiliary Verbs  add an extra dimension of meaning to the main verb of a sentence.

Auxiliary verbs are also called "modal verbs" or "helper verbs".

Examples of Auxiliary Verb

 * do (general)
 * can (expresses ability)
 * could  (expresses possiblity)
 * may (expresses permission)
 * must  (expresses a command)
 * <span style="font-size:15px;font-family:Arial;color:#000000;font-weight:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">should <span style="color:rgb(0,0,0);font-family:Arial;font-size:15px;line-height:17.25px;white-space:pre-wrap;"> (expresses an opinion)
 * <p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt;text-align:justify;"><span style="font-size:15px;font-family:Arial;color:#000000;font-weight:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">will <span style="color:rgb(0,0,0);font-family:Arial;font-size:15px;line-height:17.25px;white-space:pre-wrap;"> (expresses an intention)
 * <p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt;text-align:justify;"><span style="font-size:15px;font-family:Arial;color:#000000;font-weight:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">would <span style="color:rgb(0,0,0);font-family:Arial;font-size:15px;line-height:17.25px;white-space:pre-wrap;"> (expresses a hypothetical intention)

<span style="font-size:20px;font-family:Arial;color:#000000;font-weight:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;">Examples of Yes-No
To make a question, just move the auxiliary verb to the beginning of the sentence.