Subjunctive

A webpage on the use of subjunctive is hereby made available.
 
Here you can find more information with exercises on the subjunctive and unreal uses past forms.  Here is the key for the exercises. 

Modal verbs

Here you can find some information and exercises on modal verbs along with the key for the exercises. (Source: English Grammar in Use. Intermediate by Raymond Murphy)
Here you can find more exercises on modal verbs.

Gerund vs. infinitive

Numerous exercises on gerund vs. infinitive along with their key are hereby made available for you to have access at your convenience.  You can also find the list of verbs used with gerund and/or infinitive here.

Here you can find more information and exercises on the same topic.

Linking words

The first and second parts of the documents on linking words are hereby available.  You can also find the key for the exercises here.  As you do the exercises, please remember the following three types of linking words we have identified:

• Linking words that connect two parts of the same sentence as in the following example: We only have one week off for Easter, so we will be staying in Brussels.
• Linking words that connect two separate sentences as in the following four examples, which are different ways of saying the same thing:

1. We only have one week off for Easter.  Therefore, we will be staying in Brussels.
2. We only have one week off for Easter; therefore, we will be staying in Brussels.
3. We only have one week off for Easter.  We will, therefore, be staying in Brussels.
4. We only have one week off for Easter; we will, therefore, be staying in Brussels.

• Linking words that are covered under both the first and second types as in the four following examples:

1. Besides giving his friend a lift after work, he helped her with her grocery shopping.
2. He helped his friend with her grocery shopping, besides giving her a lift after work.
3. I am afraid I am not allowed to help you with that question.  Besides, I do not know the answer myself.
4. I am afraid I am not allowed to help you with that question; besides, I do not know the answer myself.

Note that the meaning of the word 'besides'  in the first two examples is different from its meaning in the last two examples.

In all these examples, please pay special attention to the punctuation.

State vs. action verbs

Here is  a document where you can find information and exercises on state vs. action verbs, along with key for the  exercises. (Source: English Grammar in Use: Intermediate by Raymond Murphy)

Here is a link for a webpage where you can find some  exercises on the same topic.   

Here you can find the list of verbs we have looked at. (Source: LONGMAN Advanced Learners’ Grammar by Mark Foley &  Diane Hall )

Position of adverbs

Here are the main rules and exceptions on the position of adverbs in sentences:

First rule: if there is only one verb in the sentence, the adverb comes before the verb as in the following example: He usually comes to work on time.
Exception to the first rule: if the only verb in the sentence is 'to be', the adverb comes after the verb as in the following example:  He is usually on time.

Second rule: If there is more than one verb in the sentence, the adverb comes after the first verb as in the following example: He has already arrived at work.
First exception to the second rule: if the first verb in the sentence is an auxiliary verb with 'to', i.e., have to, need to, ought to and used to, the adverb comes before the first verb as in the following example: He usually has to start working by 9:30 AM.
Second exception to the second rule: if the first verb in the sentence is a contracted negation, the adverbs 'probably', 'possibly' and 'certainly' come before the first verb as in the following example: He probably won't come to work on time.

These being the main rules and exceptions, there is more to this topic.  You can find more information on this webpage, which also provides you with some exercises. 

Here is another document with exercises on the same topic.  You can find the key for the exercises here.

First-name gender

Here you can have access to the website called "Behind the Name: the Etymology and History of First Names".  Thank you C!