Decision -ADIGAN BO'L-

One of the constructions used to express decision, "verb-ADIGAN BO'L-", is formed with the present-future participle of the verb followed by the auxiliary verb bo'l- (root meaning: 'to be, become'), which can in turn be conjugated like any verb for tense/aspect meanings.
The present-future participle is itself formed by adding to the verb stem the suffix -ADIGAN (verb stems ending in a consonant) or -YDIGAN (verb stems ending in a vowel).

With the verb yozmoq, 'to write', ending with a consonant, and in the definite past:

yozadigan bo'ldimI decided to write
yozadigan bo'ldingYou decided to write
yozadigan bo'ldiHe/she/it decided to write
yozadigan bo'ldikWe decided to write
yozadigan bo'ldingizYou decided to write
yozadigan bo'ldi / bo'ldilarThey decided to write

With the verb o'qimoq, 'to read', ending with a vowel, and in the definite past:

o'qiydigan bo'ldimI decided to read
o'qiydigan bo'ldingYou decided to read
o'qiydigan bo'ldiHe/she/it decided to read
o'qiydigan bo'ldikWe decided to read
o'qiydigan bo'ldingizYou decided to read
o'qiydigan bo'ldi / bo'ldilarThey decided to read

The negative is formed either by adding the negative suffix -MA to the auxiliary verb bo'l-, which means that no decision is taken.

yozadigan bo'lmadimI didn't decide to write
yozadigan bo'lmadingYou didn't decide to write
yozadigan bo'lmadiHe/she/it didn't decide to write
yozadigan bo'lmadikWe didn't decide to write
yozadigan bo'lmadingizYou didn't decide to write
yozadigan bo'lmadi / bo'lmadilarThey didn't decide to write

Or the negative is formed by adding the negative suffix -MA to the main verb carrying the participle, which means that the decision not to do is taken.

yozmaydigan bo'ldimI decided not to write
yozmaydigan bo'ldingYou decided not to write
yozmaydigan bo'ldiHe/she/it decided not to write
yozmaydigan bo'ldikWe decided not to write
yozmaydigan bo'ldingizYou decided not to write
yozmaydigan bo'ldi / bo'ldilarThey decided not to write