is\t-\twas\t-\tgewees\t-\tsynde ,\thet\t-\thad\t-\tgehad ,\tBUT:\tword\t-\tgeword
PRS.be\t-\tPST.be\t-\tPTCP.be\t-\tbeing\t-\tPRS.have\t-\tPST.have\t-\tPTCP.have\tPRS.become\t-\tPTCP.become
is/are/am/being - was/were - been - being, have - had - had, become - became