Give instruction how to … Boil an egg
Make a cup of tea Make soup
c. Advice and Warning
The speaker is directing the attention of the person addressed to do something  that  is  for  his  or  her  benefit,  not  the  speakers’.  It  is  up  to  the
person  who  receives  the  advice,  recommendation,  or  warning  to  decide whether to follow it.
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a. Keep your options open.
b. Remember, always buy low and sell high.
d. Suggestions
A suggestion that the speaker and the hearer go together, and so in meaning  is  very  like  French  1
st
imperative.  In  poetry,  of  course,  Let  us  go can still have the meaning of Let’s go, as in:
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Let us go then, you and I, When the evening is spread out against the sky
Like a patient etherized upon a table Use let’s or let’s not and the base form for suggestions that include
you and another.
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Examples: Let’s go
Let’s no stay
Use  why don’t  you  and  the  best  form  to  give  advice  to  another
person. And put a question mark at the end of sentences with why don’t we
and why don’t you.
14
11
Ron Cown, the Teacher’s Grammar of English …, p. 116.
12
James R. Hurdford, Grammar a Student’s Guide …, p. 96.
13
Irene E. Schoenberg, Focus on Grammar: a Basic Course for Reference and Practice, New York: Addison Wesley Longman, Inc, 2000, p.186.
Examples: Why don’t we go to my office?
Why don’t you look on the internet?
And here is its negative form:
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Let’s not stay here any longer or, less likely Don’t let’s stay here any longer.
These, of course, function often suggestions, not commands. They can  be  seen  as  functioning  more  like  commands,  however,  when  the  us  is
not  contracted  and  the  Let  us  is  seen  as  an  exhortation  to  follow  the speaker’s  instructions  or  to  agree  with  the  judgment  that  the  speaker
expresses:
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Examples: Let us pray.
Let  us  never  forget  the  brave  men  and  women  who  made  the ultimate sacrifice.
The  comments  to  introduce  common  expressions  for  making suggestions such as following.
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Examples: You could put one lamp next to the chair
You might put the coffee table in front of the sofa.
14
Irene E. Schoenberg, Focus on Grammar …, p. 186.
15
Marianne Celce Murcia and Diane Larsen Freeman,  the Grammar Book: an ESLEFL Teach
er’s Course, United State University: Heinle and Heinle Publishers, p. 233.
16
Marianne Celce Murcia and Diane Larsen Freeman, the Grammar Book …, p. 233.
17
Sandra L. McKay, Teaching Grammar …, p. 72.