The difference between gerund phrase as subject and predicate and infinitive spending too little time on the computer also shows the users are lonely. "Spending too little time on the computer" is a gerund phrase as the subject and "also shows" is the predicate Doesn't it mean that all sentences can be used in this way? For example, take money to buy vegetables. Take money as the subject and buy vegetables as the predicate

The difference between gerund phrase as subject and predicate and infinitive spending too little time on the computer also shows the users are lonely. "Spending too little time on the computer" is a gerund phrase as the subject and "also shows" is the predicate Doesn't it mean that all sentences can be used in this way? For example, take money to buy vegetables. Take money as the subject and buy vegetables as the predicate

For example, the preposition "to, for" last time, if you just thought it was a fixed collocation and didn't think about why, you would never memorize it by rote and fall into a lot of memorization

What's the difference between gerund as subject and infinitive as subject?
Let's talk about the essence. Give some more examples when they are not interchangeable

I. the similarities between gerund and infinitive as subjects
1. When infinitive phrases and Gerunds are used as subjects, it is often used as the formal subject in order to keep the balance of sentences
It is not easy to learn English well.
It is no use asking him for help.
2. If the subject uses the infinitive, the predicative and the object should also use the infinitive; if the subject uses gerund, the predicative and the object should also use gerund, which is called symmetry in English
To see is to believe. = seeing is believing
(85)It is better to stay home than _ A__ out.
A.to go B.going C.go D.gone
The difference between gerund and infinitive as subject
1. The infinitive as the subject often means a specific action; when it means a general or general abstract concept, it often uses gerund, such as:
(92)_ B_ is a good form of exercise for both young and old.
A.The walk B.Walking C.To walk D.Walk
2. After "there / it + be + no use (good / help / need)", gerund is often used as subject, while infinitive is seldom used
It /There is no use crying over the split milk.
It /There is no help taking this medicine.
But if for is used in this sentence pattern to lead to the logical subject of the infinitive, only the infinitive can be used
(93) There is no good for us to do that exercise.
3. Infinitives can be used with when, where, how, what, what, etc. as subject, object and predicative in sentences, while gerunds can't
How to solve the problem is a hot potato.
Where to put the box seems hard to decide.
Whether to do it hasn’t been decided.
What to do next is up to you.

What is the difference between gerund as subject and infinitive as subject

First of all, the infinitive is used as the subject, for example: to pass the exam, I + verb "In order to pass the exam, I..." But gerund does not have this function. It just omits person and emphasizes the function of subject verb