regretful - типичные ошибки в английском со словом regretful
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Не правильно ❌ Правильно ✅ Пояснение
1. I made several regretful mistakes.

2. I am regretful to inform you that your application h as been unsuccessful.

1. I made several regrettable mistakes.

2. I regret to Inform you that your application has been unsuccessful.

1. regretful = feeling or expressing regret
regrettable = to be regretted

2. Regretful is usual ly used to describe real feelings: 'I felt rather regretful that I couldn't go with them.' 'She gave me a regretful look.'
I/We regret to ... is a polite expression used chiefly in formal letters.