Verbs with a stem that ends in -d add the -t in the second and third person singular.
rijden = to drive
ik rijd/rij (the d may be written but it is not pronounced)
jij rijdt
u rijdt
hij/zij/het rijdt
wij rijden
jullie rijden
zij rijden
houden = to hold
ik houd/hou
jij houdt
u houdt
hij/zij/het houdt
wij houden
jullie houden
zij houden
The t of the second person singular is dropped when you ask a question:
rijd jij?
houd jij?
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One Comment
you state that the ´d´ in ´ik rijd´ may be written, but is not pronounced. In fact it´s optional in pronounciation as well as in writing. So you can say and write ‘ik rij’ and ‘ik rijd’.