The third person singular verb form in English is distinguished by the suffix -s, which is added to the stem of the so-called infinitive form. Verbs given in the infinitive form are typically written with to in front, as in to sleep or to walk. Often we simply add the letter s to the infinitive form (as in sleep sleeps and run runs), but in other cases we need to modify the end of the word. Here are some simple rules we could consider:

If the verb ends in y, remove the y and add ies. Example: cry becomes cries.

If the verb ends in o, ch, s, sh, or x, add es. Example: push becomes pushes, and hiss becomes hisses.

Otherwise, just add s.

Implement a function singular verb() that takes a verb in its infinitive form (but without to) as an argument and converts it to its third person singular verb form according to the rules above. You might find the string function endswith helpful here. Suppose the variable name represents the string "Wolfie". Then name.endswith(e) and name.endswith(ie) would both evaluate to True, whereas name.endswith(E) and name.endswith(in) would both evaluate to False.

As we can see, the rules arent perfect play should really have been replaced with plays to be gramatically correct, but your function will instead return plaies.

Examples: Function Call Return Value singular verb wax' waxes' singular-verb type 'types' singular-verb go' goes' singular verb ('play plaies