Suppose we want to call our friends for some action, we will say “Let us go”, “Let us start lunch” etc.

In Marathi such form is created by suffixing “ऊया” (UyA) to the verb. Also generally sentence is started with चला (chalA) which is a kind of exclamation or call for action.

Examples:
Let’s play:- चला, आपण खेळूया (chalA, ApaN kheLUyA)
Let’s go:- चला, आपण जाऊया (chalA, ApaN jAUyA)

“आपण” can be omitted.
Let’s speak:- चला, बोलूया

Negative sentence:

The negative sentence can be formed by adding “नको” (nako) before the verb. Generally, चला (chalA) will not be used as we are not calling for any action.

Examples:
Let’s not play:- आपण नको खेळूया (ApaN nako kheLUyA)
Let’s not go:- आपण नको जाऊया (ApaN nako jAUyA)
Let’s not speak:- नको बोलूया (nako bolUyA )

In English question is created using phrase “Shall we”
In Marathi questions can be asked in two ways.
1:  Verb + “ऊया” (UyA) का (kA)
2:  The Second form is created by the suffixing form of “आयचा” (AyachA) to the verb. Depending on the gender and multiplicity of the noun required form is suffixed. Forms are आयचा-आयची-आयचे-आयचे-आयच्या-आयची ( AyachA-AyachI-Ayache-Ayache-AyachyA-AyachI ).
e.g.
The verb is “खा”. For Masculine-Singular noun “आंबा” we will say “आंबा खायचा”
For Feminine-Singular noun “चिंच ” we will say “चिंच खायची”

Examples:
Shall we play cricket?
1) क्रिकेट खेळूया का? ( krikeT kheLUyA kA?)
2) क्रिकेट खेळायचे का? ( krikeT kheLAyAche kA ? )

Shall we watch movie?
1) सिनेमा बघूया का? ( sinemA baghUyA kA ?)
2) सिनेमा बघायचा का? ( sinemA baghAyachA kA ?)

Shall we go home?
1) घरी जाऊया का? ( gharI jAUyA kA?)
2) घरी जायचे का? ( gharI jAyache kA? )

Shall we eat mango?
1) आंबा खाऊया का? ( AMbA khAUyA kA? )
2) आंबा खायचा का? ( AMbA khAyachA kA? )

Shall we eat tamarind?
1) चिंच खाऊया का? ( chiMch khAUyA kA ?)
2) चिंच खायची का? ( chiMch khAyachI kA ?)

There is another usage of “Let”
e.g. “Let him play”, “Let him study quietly”
By such a sentence you are asking someone to allow the activity to happen freely.

In Marathi such a sentence is formed by appending “ऊ दे”( U de) to the verb.

This is an imperative/command statement so as you can guess for you-plural suffix will be “ऊ द्या” (U dyA)
Examples will make it clear

Examples:
Let him play:- त्याला खेळू दे (tyAlA kheLU de )
Let me eat:- मला खाऊ दे (malA khAU de )
Let her speak:- तीला बोलू दे (tIlA bolU de )
You all, Let him play:- त्याला खेळू द्या (tyAlA kheLU dyA )
You all, Let me eat:- मला खाऊ द्या (malA khAU dyA )
You all, Let her speak:- तीला बोलू द्या (tIlA bolU dyA )

Negative sentence:

We have already seen how to create negative imperative sentences. So negative imperative for verb “दे” (de) is “देऊ नकोस”(deU nakos ) for singular you
and “देऊ नका”(deU nakA) for plural you.

Take the below examples:
Don’t let him play:- त्याला खेळू देऊ नकोस (tyAlA kheLU deU nakos)
Don’t let me eat:- मला खाऊ देऊ नकोस (malA khAU deU nakos)
You all, don’t let her speak:- तीला बोलू देऊ नका (tIlA bolU deU nakA)
You all, don’t let me eat:- मला खाऊ देऊ नका (malA khAU deU nakA)

Try creating sentences with different verbs using above rules. Crosscheck them by creating same by “verb forms” feature on https://learnmarathiwithkaushik.com/