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Both 还 and 又 may be used to indicate an addition to the preceding information:

我买了香蕉、苹果还买了葡萄。
我们不但要努力学习，还要考得好。

昨天没考好，现在又撞伤了，真倒霉。
他要买肉又要买鱼。

May I exchange both in all above examples? If not, what are the rules involved?

EDIT

Short answer according to what I could understand from Frank Joe's reply:
还 = also
又 = and to make things worse

Both 还 and 又 may be used to indicate an addition to the preceding information. For example:

• 我买了香蕉、苹果还买了葡萄。
• 我们不但要努力学习，还要考得好。
• 昨天没考好，现在又撞伤了，真倒霉。
• 他要买肉又要买鱼。

May I exchange both in all above examples? If not, what are the rules involved?

EDIT

Short answer according to what I could understand from Frank Joe's reply:

• 还 = also
• 又 = and to make things worse

Both 还 and 又 may be used to indicate an addition to the preceding information:

我买了香蕉、苹果还买了葡萄。
我们不但要努力学习，还要考得好。

昨天没考好，现在又撞伤了，真倒霉。
他要买肉又要买鱼。

May I exchange both in all above examples? If not, what are the rules involved?

Thank you

EDIT: Short answer according to what I could understand from Frank Joe's reply:
还 = also
又 = and to make things worse

Both 还 and 又 may be used to indicate an addition to the preceding information:

我买了香蕉、苹果还买了葡萄。
我们不但要努力学习，还要考得好。

昨天没考好，现在又撞伤了，真倒霉。
他要买肉又要买鱼。

May I exchange both in all above examples? If not, what are the rules involved?

EDIT

Short answer according to what I could understand from Frank Joe's reply:
还 = also
又 = and to make things worse

Both 还 and 又 may be used to indicate an addition to the preceding information:

我买了香蕉、苹果还买了葡萄。
我们不但要努力学习，还要考得好。

昨天没考好，现在又撞伤了，真倒霉。
他要买肉又要买鱼。

May I exchange both in all above examples? If not, what are the rules involved?

Thank you

Both 还 and 又 may be used to indicate an addition to the preceding information:

我买了香蕉、苹果还买了葡萄。
我们不但要努力学习，还要考得好。

昨天没考好，现在又撞伤了，真倒霉。
他要买肉又要买鱼。

May I exchange both in all above examples? If not, what are the rules involved?

Thank you

EDIT: Short answer according to what I could understand from Frank Joe's reply:
还 = also
又 = and to make things worse