Band 5+: You are organizing a farewell dinner for a mentor who is retiring after many years of service. Write a letter to a former colleague inviting them to the dinner. You should include details about: - who the dinner is for and why it is a significant milestone - the date, time, and venue of the dinner - any contribution or gift you would like them to be part of

The letter covers all the required points: the reason for the farewell and the colleague's achievements, the date, time, and venue, and a request for contribution. The tone is appropriate and the purpose is clear. However, there are some lapses in clarity and formality. For example, the greeting 'Dear Colleagues !' is informal and the punctuation is incorrect. The phrase 'she has been worked with us 6 years' is grammatically awkward; it should be 'she has worked with us for 6 years.' Also, 'by looked upon all her achievements' is not standard English; consider 'considering all her achievements.' The request for contribution could be more polite and specific, e.g., 'I would appreciate it if you could contribute Rs.1000 each to cover the cost of a photographer and a gift for her.' Additionally, the closing 'Your presence make her feel pleasant' could be rephrased as 'Your presence would make her feel appreciated.' Overall, the letter is effective but would benefit from more polished language and a more formal tone.

The letter has a clear overall structure with an introduction, body, and closing, but the flow is disrupted by abrupt transitions and some unclear references. For example, the shift from describing Sadia's achievements to the dinner details is sudden. Use linking words and phrases to connect ideas more smoothly, and ensure each paragraph has a clear central topic. The greeting 'Dear Colleagues !' is informal and the exclamation mark is inappropriate; use 'Dear colleagues,' instead. The closing 'Thanks and Kind Regards' is acceptable but could be more formal.

The vocabulary is adequate for the task but limited in range and precision. Phrases like 'she has been worked with us 6 years' and 'by looked upon all her achievements' are awkward and not idiomatic. Use more varied and precise vocabulary, such as 'dedicated', 'instrumental', 'contribution', 'celebrate', and 'commemorate'. Also, avoid informal expressions like 'just because of her' and 'made things easier for us' - instead, say 'thanks to her efforts' or 'she consistently supported us'. The letter would benefit from more sophisticated and natural word choices.

There are numerous grammatical errors that affect clarity and accuracy. Examples include: 'she has been worked' (should be 'she has worked'), 'with us 6 years' (missing 'for'), 'her behaviour with all of us were' (subject-verb agreement: 'behaviour' is singular, so 'was'), 'by looked upon' (incorrect verb form), 'i am organizing' (capital 'I'), and 'Your presence make her feel pleasant' (should be 'will make'). Punctuation is also inconsistent, such as the exclamation mark after 'Colleagues' and missing commas. To improve, review verb tenses, subject-verb agreement, and sentence structure. Practice writing with a variety of sentence types and ensure each sentence is grammatically correct.