Adjective + To-Infinitive (It's easy to learn)

No. You primarily use adjectives that describe opinions, feelings, or characteristics of an action. These include words like easy, hard, difficult, impossible, important, essential, crucial, wise, good, bad, nice, pleasant, sad, glad, surprised, relieved, eager, unlikely, certain, possible, necessary, convenient, annoying, interesting, fascinating, boring, tiring, dangerous, safe, expensive, cheap, quick, slow. Adjectives describing physical attributes (blue, wooden, tall) or states (sleeping, awake) generally do not fit this pattern as they cannot describe the quality of an action.

Both sentences convey a similar meaning, but they emphasize different aspects. Learning is easy uses the gerund learning as the grammatical subject. This sentence directly asserts that the activity of learning possesses the quality of being easy. In contrast, It's easy to learn uses the impersonal It as an anticipatory subject, with the to-infinitive to learn functioning as the logical subject. This structure emphasizes the inherent quality of the action—its ease—rather than the noun-like activity itself. The It's + adjective construction often sounds more natural and idiomatic for expressing general opinions about actions. While often interchangeable in meaning, the It's...to form is typically preferred for impersonal observations.

Yes, absolutely. This is a very common and important extension of the pattern. When you want to clarify who experiences the quality of the action, you insert for followed by the object pronoun (e.g., me, him, her, us, them) or a noun (e.g., students, the team) directly after the adjective and before the to-infinitive. For example, It's difficult for me to concentrate in a noisy environment means that I find it difficult. Similarly, It was challenging for the engineers to solve the complex problem indicates that the engineers faced the challenge.

While superficially similar, there's a subtle distinction in meaning and common usage. It's good to know is the standard and most common expression using the Adjective + To-Infinitive pattern. It means that the act of knowing something is beneficial or positive. For example, It's good to know that the train runs on time. Here, the infinitive to know refers to the action of acquiring knowledge.

The verbs used in the to-infinitive part of this construction are generally actions that can be judged or commented upon. There isn't a restrictive list of verbs, but you'll frequently encounter common action verbs like do, say, make, find, understand, learn, solve, predict, begin, finish, start, stop, reach, see, hear, talk, read, write, follow, use, maintain, control, manage, coordinate, balance, concentrate, wake up, arrive, contribute, collaborate, meet, schedule, establish, overlook, spot, pinpoint, practice, include, measure, stay, keep, please, resist, help, expect, wait, and welcome. The key is that the verb denotes an action whose nature can be described by an adjective.

The Adjective + To-Infinitive structure is remarkably neutral in terms of formality. You will encounter it across all registers of English. Phrases like It's a pleasure to meet you are perfectly appropriate in formal business settings, while It's fun to hang out is common in casual conversations with friends. Its widespread utility makes it adaptable to nearly any communicative context, from academic writing to social media posts. The formality often derives more from the choice of adjective itself (e.g., It's crucial vs. It's important, or It's delightful vs. It's nice) rather than the grammatical structure.