Future tense pattern 2

According to Mounce's categorization, future tense verbs of pattern 2 are those where the present tense and the future tense equivalents are derived from completely different roots. There are only 9 of them in the New Testament and they are all common words so are worth memorising. These verbs are classified as type v-8 in MBG.

In the table of comparison below, the roots are show in brackets.:

How the future tense verbs are derived from their roots is regular. For example:
 * ὄψομαι: οπ + tense formative σ results in ψ by square of stops