The evaluation of a translation with regards to the grammatical components must be governed by the criterion of correctness. Like most of the developed language Hindi is also having a grammar and following grammar is necessary for consistent and standard text. Any popular grammar book like 'हिंदी व्याकरण' of Kamta Prasad Guru (कामता प्रसाद गुरु) can be accepted as reference. We should not do any mistake of grammar,  spelling, and punctuation.