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It depends on the context. 'Ground' is already past tense. It is the past tense of 'grind'. On the other hand, you can be 'grounded' for staying out past your curfew.
Regional
dynamic
the shaking of the earthquake
using lots and lots of testing to prove facts about the earth's past.
"added" is the past tence for "add". there is no past tence for "added"
sit is not the past tence verd of set sit is that past tence of sat
"They were given" is in the past tense. It is the past tense of the verb "to give," indicating that the action of giving happened in the past.
asked is past tence
the past tence of "write" is wrote.
chopped
Sprang
swam
The past tense of must is should have
Were is the past tense.
no it is a future tence verb
ridden