When expressing a suggestion, which formulation is correct?

The formulation "I suggested that he rest" is correct because it follows the proper grammatical structure for expressing suggestions in English. In this construction, "suggest" is followed by the subjunctive form of the verb "rest," which does not take an "s" at the end, regardless of the subject. This construction effectively communicates a recommendation or an idea that the speaker believes would be beneficial without implying a command or obligation, which is suitable for suggestions.

Using the subjunctive mood is appropriate when making suggestions or proposals, as it allows for a more hypothetical expression of advice rather than stating something as a fact. This makes the suggestion sound more tentative, which is often appropriate in a professional or healthcare context. This respectful approach is important in communication where you may be advising patients or colleagues.

Other options do not correctly capture the intended meaning or grammatical norms for making suggestions. For instance, using "recommended that he rests" would inaccurately apply a standard tense where the subjunctive should be used. Meanwhile, "I recommended him to rest" changes the verb structure inappropriately, and "I advised him resting" misuses "advised" in conjunction with a gerund. Each of these contains significant grammatical errors or awkward phrasing, making