Band 4+: You were invited to a dinner party at a friend's house, but due to unforeseen circumstances, you were unable to attend at the last minute. Write a letter to your friend. - Apologize for not being able to attend. - Explain the reason for your absence. - Express your regret and suggest an alternative arrangement.

The letter addresses all three requirements of the task: it expresses regret, provides a reason for the absence, and suggests a time to meet. The tone is appropriate for a letter to a friend. However, the response is somewhat brief and could benefit from more development to fully satisfy the requirements of a high-level response. To improve, try to expand on the details; for example, instead of just saying you were 'out of town for work,' you could briefly mention the nature of the trip or why it was unavoidable. Additionally, ensure grammatical accuracy, particularly regarding sentence fragments (e.g., 'Because I was out of town...') and minor typos (e.g., 'availaible'). The letter falls short of the required 150 words.

The letter follows the required structure and addresses all three bullet points. However, the flow is somewhat disjointed due to short, choppy sentences. For example, 'Because I was out of town on the same day for my work' is a sentence fragment rather than a complete sentence. To improve, try using subordinating conjunctions (e.g., 'I was unable to attend because I was out of town...') to connect ideas and create a smoother transition between thoughts.

The vocabulary used is basic and functional, which is sufficient to convey the message but lacks the sophistication expected for higher bands. There are also some minor spelling errors (e.g., 'availaible'). To improve, try to use more varied expressions. Instead of repeating 'really sorry,' you could use 'sincerely apologize' or 'deeply regret.' Instead of 'spend good time,' you could use 'catch up' or 'enjoy each other's company.' Boost vocabulary complexity to elevate the overall score.

There are several grammatical inaccuracies that affect the professional quality of the writing. Issues include incorrect verb usage ('you were invited me' should be 'you invited me'), capitalization errors ('i' instead of 'I'), and sentence fragments. Additionally, 'I will sure come' is grammatically incorrect and should be 'I will surely come' or 'I will certainly come.' Focus on mastering subject-verb agreement and ensuring every sentence has a complete thought.