Happiness is depend on a person’s view of their life.
Students often mistakenly add to be to V1 to make present simple tense. It could be that they have seen other structures using to be and apply the same ‘rules’ to present simple verb forms.
Let’s take a look at some structures that use to be and think about those that do not.
In these examples, adjectives give information about nouns: ‘red‘ tells us about ‘Roses‘, ‘tired‘ tells us about ‘I‘, etc. Notice that the verb to be needs to ‘agree’ with the subject. ‘Are‘ agrees with ‘Roses‘ (3rd person plural 1), ‘Am‘ agrees with ‘I‘ (1st person singular 1), etc.
In these examples, nouns give information about other nouns. ‘Doctor‘ gives information about ‘I‘, ‘office chairs‘ gives information about ‘these chairs‘, etc. Notice again that in each example the verb to be agrees with the subject. ‘Am‘ agrees with ‘I‘ (1st person singular 1), etc.
In these examples preposition phrases give information about nouns: ‘in his office‘ tells us about ‘He‘, ‘on the back of the truck‘ tells us about ‘The chairs‘, etc.
In our opening example, to be is put before the verb depend (V1).
This is incorrect! The only time to be appears before a verb is when the form of the verb is continuous:
Notice the tense may be past, present or future! Again, make sure that subjects ‘agree’ with verbs!
If you are not familiar with the conjugation of verbs (1st person, 2nd person, etc.), see here.