go to church
The Spanish phrase 'ir a la iglesia' translates to 'go to the church' in English. It is a verb phrase, with 'ir' being the verb meaning 'to go', 'a' being a preposition meaning 'to' and 'la iglesia' being a noun phrase meaning 'the church'. This phrase is often used to talk about the action of going to attend a church service or visit a church.
I am going to go to church this Sunday
This sentence is in the future tense, expressing an intent to go to the church in a specific future time, which is 'this Sunday'. The phrase 'Voy a' indicates the future tense.
You should go to the church early to find a seat
This sentence is an advice or a recommendation to go to the church early in order to find a seat. The verb 'Deberían' is a modal verb meaning 'should' in English.
I could not go to the church because of the rain
This sentence is in the past tense, expressing the inability to go to the church due to an obstacle, which is 'the rain'. The phrase 'No pude' means 'I could not'.