In which sentence is the underlined verb irregular? we brought a picnic lunch when we toured the monuments in washington, d. c. we have planned a trip to washington, d. c., to tour its many monuments. we walked several blocks to tour the monuments in washington, d. c.

Brought 
Brought is the only irregular verb in the sentences. It is irregular because it does not follow the regular rules to change from present to past. You switch bring to brought NOT bringed.

Some cultural backgrounds have different superstitions or customs, this can play a part in how they decide things. superstitions are important to a culture for example, an asian culture has a superstition about women putting their purses on the ground their money will be gone, therefore people in that culture try everything they can to not let their purse touch the ground in fear of it being true. also like how we avoid walking under ladders in fear of bad luck. customs may also play a key role a custom also know as a tradition, is something people in the culture have been doing for generations as a quick example, if a family has a necklace that the family's mother passes it on to her daughter in so on it's a custom in that family.