"to have," is rendered "could" in Mark 14:8 , "she hath done what she could," lit., "she hath done what she had." See HAVE.
"to have strength," is translated in Mark 14:37 "couldest thou not." See ABLE.
Notes: (1) Emblepo in Acts 22:11 , lit., "I was not seeing," is translated "I could not see." See BEHOLD. (2) See CAN , when not used as part of another verb.