Some simple sentences -1
Let us start with a few simple sentences with simple verbs and subjects. Verb changes with the form of the subject. In Sanskrit, the root form of a verb is called dhatu. For example the root for the verb read is 'path (पठ्)'.
The dhatu (धातु) then takes different forms based on the number, tenses and the person form of the subject in a sentence. But not takes different forms in gender.
Lets us see how 'path' dhatu (पठ् धातु) takes different forms in some cases.
Let's say you want to ask, who is reading referring a girl (feminine) . Then you say ' kaa pathati? (का पठति?)'. Here 'kaa' (का) means who in a feminine form. The verb path (पठ्) becomes pathati (पठति).
If you want to ask the same question in a masculine form that would be 'kaha pathati (कः पठति). Here 'kaha' (कः) means who in a masculine form. But notice that the verb pathati (पठति) remains the same.
When you say, You read, that would be 'tvam pathasi (त्वं पठसि)' Here 'tvam (त्वं) means You. Please note that the verb path becomes pathasi (पठसि).
When you say, I read, that would be 'aham pathaami (अहं पठामि)' Here 'aham (अहं ) means I. And path dhatu (पठ् धातु) takes the form of pathami (पठामि).
In order to know more about tenses please navigate here.
Similarly, lets make some more sentences using different dhatus.
Seeta plays. 'Seeta kreedati ( सीता क्रीडति )'
you play. 'tvam kreedasi (त्वं क्रीडसि )'
I play. ' aham kreedaami (अहं क्रीडामि )'
Alex says. ' Alexha vadati ( अलेक्षः वदति )'
You say. 'tvam vadasi (त्वं वदसि )'
I say. 'aham vadaami (अहं वदामि )'
This person (referring to he) sits. 'eshaha upavishati (एषः उपविशति)'
You sit. 'tvam upavishasi (त्वम् उपविशसि )'
I sit. 'aham upavishaami (अहम् उपविशामि )'
Now you got the drift. Now you know how to make very simple sentences using very simple words. Experiment with your own words if you like. Good luck!