The affix liṅ (Benedictive) comes after a verb when the agent either 1. commands 2. invites 3. permits 4. politely expresses a wish 6. asks questions or 7. prays.,
The word विधिः means 'commanding or directing a subordinate'; निमन्त्रणं means 'giving invitation'; आमन्त्रणं means 'expressing permission to do as one likes'; अधीष्ठः means 'to politely express a wish'; सम्प्रश्नः means 'a question'; and प्रार्थना means 'a prayer'.
This excludes all other tense-affixes. Thus:--
(1)\tकटं कुर्यात् 'let him make the mat'; ग्रामम् भवान् आगच्छेत् 'you come to the village';
(2 and 3) इह भवान् भुञ्जीत 'you will or may dine here'; इह भवान् आसीत 'here you will or may sit';
(4) अधीच्छामो भवन्तं माणवकं भवानुपनयेत 'we wish that you should condescend to initiate this boy';
(5) किं भो व्याकरणमधीयीय उत तर्कम् ? 'Sir, what shall I learn, the Grammar or the Logic'?
(6) भवति मे प्रार्थना व्याकरणं अधीयीय 'this is my prayer that I should learn Grammar'.,