1. The models can be presented to students. Ask them to make a comparison with their own and point out what're to be noted for these writing tasks.

For example, in task 1, summarise the information given by the graph first before going to details. When reporting main features, also write center ideas before supporting figures. And use transitional words properly to make the reporting logical and coherent.

In task 2,  state the opinion clearly and briefly at the very beginning,  and explain the reason why in the following paragraphs with sufficient sample or evidence. Show the logic by the proper use of cohesive devices. 

2. I think the key elements that an examiner are looking for include logic, views on certain phonomenon, and the ability to present the views convincingly and clearly

students need to have good samples to follow before they start to write.

In task 1, they need to understand the importance of wrting an overview, then make contrast and comparsion. learning to use trend language in vital in line graph.

In task 2, they need to know the basic structure of this kind of essay, it's good to show them different kinds of tasks( discussion, causes and effects, argument...)

Q1: A:These two models are all good examples. In my teaching, firstly, I will analyze the structure of writing to the students. For example, in Task 1, there are three paragraphs. In the first para, the first sentence shows the topic of the graph and the following sentences describe the basic idea of the graph. Para 2 describes the graph from two points, all species and the individual turtle species from two periods of time, from 1980 to 1982 and between 1990 and 2012, and shows the trend of line. Para 3 makes the comparision between Olive Ridley Turtles and Leatherback and Green Turtles. Secondly, I will ask students note the use of words, for example, verbs, adj. and some adv, such as relatively constant, slight increase, levelled off, slight fluctuations, relatively stable, decrease, plummeted, steady rise, plateauted, however, while, in contrast and minor fluctuations. These words can decribe the lines of graph clearly, which makes the writing coherent.

Q2: A: I think that an examiner will consider the follwoing points as the key elements : 1. the structure of writing

2. whether the questions have been answered

3. coherence and cohesion

4. the use of appropriate words and the correct sentences

5. Whether the writer gives the supportive information to support his or her ideas

It's quite helpful to tell our students to use cohension cohenrence words and phrases.

It's helpful for our students to make notes of those good expressions in the models.