It has a rule or not in letter G?

[Fleur de mort]

Additionally, one might want to observe the following generalizations (rules):

1. If ‘e’ follows ‘g’ and it appears at the end of a word or syllable, it’s pronounced /¥/ in loan words like ‘garage’, ‘rouge’. It may also be pronounced as /dz/ as in the above examples and those cited by Anglika & others.

2. Retain the hard ‘g’ even if ‘er’, ‘ing’ or ‘y’ is added to the word.
Ex. digger, bagging, baggy.
Exceptions: exaggerate, suggest.

3. The ‘g’ at the end of a word is usually represented by the hard sound.
Ex. drug, dig, big.

4. When ‘d’ is followed by ‘ge’, the ‘d’ is silent.
Ex. bridge, badge, ledge.

5. At the beginning of a word or syllable, ‘gh’ usually is represented by the hard sound but silent if it’s at the end.
Ex. ghost, ghastly; though, dough.

6. ‘g’ is hard before ‘ui’, ‘ue’ & ‘ua’ and the ‘u’ is silent but it may also be pronounced as /gw/.
Ex. guilt, guess, language, linguist.

7. ‘gue’ at the end of a word is usually hard and 'ue' is silent.
Ex. plague, dialogue, vague.
Exceptions: dengue

8. ‘g’ is silent in ‘gm’ or ‘gn’.
Ex. gnaw, gnome; assign, campaign.

There’re of course many other rules to be formulated and they’ll always be exceptions.

Oh it's great
thanks a lot Buddhaheart
I realy appreciate it (:

[Altar_II]

I guess this really depends on whether it is in a loan word or a native germanic one.

G in french-loan words(including those from old french, which seem quite indigenous to English) has been palatalized if followed by a front vowel. But germanic words retain the [g] sound.

People tend to palatalize 'g' before a front vowel if it appears in a Latin. But there are different ways to pronounce latin words, i like to copy the ancient way, in which all 'g's are unpalatalized.