YACER = TO LIE/BE LYING

yago = I lie (present tense)
yaces = you lie (present tense)
yace = he or she lie (present tense)
yacemos = we lie (present tense)
yacéis =  you (plural)lie (present tense)
yacen =  they lie (present tense)
yacía = he or she laid (imperfect tense)