Past verb
Present verb
Idiomatic meaning
فَرِحَ
يَفْرَحُ
he became happy / he becomes happy
عَمِلَ
يَعْمَلُ
he acted / he acts
عَلِمَ
يَعْلَمُ
he knew / he knows
ضَحِكَ
يَضْحَكُ
he laughed / he laughs
قَدِمَ
يَقْدَمُ
he arrived / he arrives
فَرِحَ describes becoming happy, while ضَحِكَ describes laughing. A person may do both, but the meanings are different.