There is always such invention known as "dictionary"
Try - make an attempt or effort to do something
Will - expressing willingness to carry out a request or
suggestion
Shall - expressing a strong assertion or intention
Must - be obliged to and should; expressing insistence
USAGE There is considerable confusion about when
to use shall and will. The traditional rule in standard English is
that shall is used with first person pronouns ( I and we) to form
the future tense, while will is used with second and third persons
( you, he, she, it, they):: I shall be late; | she will not be
there. When expressing a strong determination to do something, the
traditional rule is that will is used with the first person, and
shall with the second and third persons: | I will not tolerate
this; | you shall go to school. In practice, however, shall and
will are today used more or less interchangeably in statements
(although not in questions). Given that the forms are frequently
contracted ( we'll, she'll, etc.), there is often no need to make a
choice between shall and will, another factor no doubt instrumental
in weakening the distinction. In modern English, the
interchangeable use of shall and will is an acceptable part of
standard U.S. and British English.
