Two uncountable nouns are connected with and as the subject. What verb should be followed? Singular and plural?

Two uncountable nouns are connected with and as the subject. What verb should be followed? Singular and plural?

Add to the plural
Both milk and tea are my favorite drinks

When a noun is a subject, what is the singular verb, what is the plural verb, what is the uncountable noun
When a noun is a subject (subject system structure), what does a noun mean when it is a singular verb, what does a noun mean when it is a plural verb, what does an uncountable noun mean when it is a subject?

The singular of countable nouns is the subject
The book is mine
This tree is old
The plural of countable nouns is the subject
Tigers are wild animals
Children are lovely
The subject of uncountable nouns should be regarded as singular, and the copulars should be in the past tense
Water is clean
Beer is enough
OK?
I hope I can help you!

When do you start with a gerund, when do you start with a verb infinitive? What other ways do you use to be the subject?
Such as the title

Both infinitives and Gerunds can be used as subjects in sentences. Generally speaking, we should pay attention to the following points: 1. Infinitives generally mean specific and specific actions; while - ing participles generally mean abstract and general actions. 2. In interrogative sentences, only the compound construction of gerunds can be used as subjects. 3. In some sentence patterns, it is usually necessary to

English: when to use infinitive when to use gerund when to use original form when verb is subject?
Feeling is believing or to see is to believe

Grammatically speaking, both are OK, but the meaning is different
Seeing is believing
Flying kites in the sun is fun
To see is to believe
To do means to plan to do something