ConSENtio
ConSENtire, conSENsi, conSENsus
Agree
There will always be -SEN- in the word
ConSisto
conSistere, conStiti
Halt, stop, stand still
Usually -SIS- but always -S- in the word
ConTENdo
conTENdere, conTENdi, conTENus
Hurry, march, struggle
(Always -TEN- in the word)
*we hurried/marched/struggled for TEN hours