Band 4+: You are hosting a dinner party to celebrate your promotion at work and want to invite a colleague who has been supportive. Write a letter to invite them to the dinner. You should include details about: - the reason for celebration and why their presence is important - the date, time, and venue of the dinner - what they can expect or whether they need to bring anything.

The letter appropriately addresses all three bullet points: the reason for the celebration (recent promotion), the date/time/location, and a request to bring food or drink. The tone is friendly and suitable for a personal invitation. Minor omissions include not explicitly stating the reason as a promotion (only 'recent event at work') and not specifying the type of food/drink, but these are acceptable lapses. To improve, you could mention the promotion explicitly and suggest specific items (e.g., 'a dessert or a bottle of wine'). The letter falls short of the required 150 words.

The letter is generally easy to follow, but there are minor lapses in coherence. The reason for the celebration is mentioned but could be more specific (e.g., 'recent event at work' is vague). The flow is logical, but the paragraphing could be improved by separating the invitation details from the request for food/drink. Consider using clearer transitions between ideas.

The vocabulary is adequate but somewhat limited and informal. Phrases like 'thrilled ro invite' (typo for 'to') and 'special guest' are appropriate but lack sophistication. The word 'cottage' is used, but it may not fit with 'city center' - consider 'apartment' or 'house' for consistency. To improve, use more varied and precise vocabulary, such as 'delighted to invite' or 'celebrate a recent promotion.' Boost vocabulary complexity to elevate the overall score.

There are several grammatical errors and phrasing issues that affect clarity. Examples: 'ro' should be 'to', 'i' should be capitalized as 'I', 'recent event' needs an article ('a recent event'), and 'bring dish or drink' should be 'a dish or a drink'. Punctuation is mostly correct, but the sentence structure is simple. To improve, use a wider range of structures (e.g., complex sentences) and proofread for errors.