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The present simple really is as easy as it sounds. Unlike many languages, in English regular verbs don t have to change much for each subject pronoun (I, you, he, she, it, we or they). 1st person singular: I like 2nd person singular/plural: You like 3rd person singular: He/she/it likes 1st person plural: We like 3rd person plural: They like As soon as the students have learnt the verb to like or any other regular verb, they re ready to get started with the present simple, as long as they remember to use s or es at the end of the verb in the third person. I list first, second and third person singular and plural so that you can identify which is which. However, the only one you commonly need to correct in TEFL is third person singular because students often forget to use s at the end of a verb in the present simple. It s unwise to bombard students with grammar jargon. Just use what s necessary to explain the point. So referring to he/she/it is clearer than saying third person singular. The tricky part for students is the negative and question forms where you use do , does and don t . In the negative, you put do not and does not before the main verb. I, you, we, they don t/do not like: What do I/you/we/they like He, she, it doesn t/does not like: When does he/she like to drink beer We teach the verb to be separately as it behaves in a different way in the positive, negative and question forms: I am/ m (not) here. You/we/they are/ re (not) here. He/she/it is/ s (not) here. Am I here Are you/we/they here Is she here

The security advisory of the Van Dyke VShell SSH Gateway for Windows format string vulnerability provides a good illustration of these points and can be found at http://nvd.nist.gov/nvd.cfm cvename=CVE-2001-0155. This is quite a severe vulnerability. An arbitrary code execution vulnerability in a component that authenticates users effectively removes all access control from that component. In this case, a skilled attacker could capture the plaintext of all user sessions with relative ease, or take control of the system with ease. To summarize, a format string bug occurs when user-supplied data is included in the format specification string of one of the printf family of functions. The attacker supplies a number of format specifiers that have no corresponding arguments on the stack, and values from the stack are used in their place. This leads to information disclosure and potentially the execution of arbitrary code.

Issues in 3GPP/WLAN interworking and IEEE 80221 media-independent handoff will certainly arise in the convergence of networks that is envisaged One of the fundamental factors in the access technologies is data rate Table 132 shows the data rates for various access technologies Due to the different data rates in the access technologies, some services may be terminated during vertical handoffs between access technologies Rate-adaptive services are also needed when services move from one access technology to another Mappings of traf c classes between access technologies are dependent on the traf c classes available in each technology ZigBee has two traf c classes: one based on a contention period (CP), the other based on a contention-free period (CFP) or guaranteed time slot (GTS) The former is based on CSMA/CA and is for non-realtime traf c; the latter is based on reservation and is for real-time traf c.

1. Gary Gibbons, Brane-Worlds, Science 287 (January 7, 2000): 49. 2. Interview with Stanley Deser, Brandeis University, November 22, 2002.

Figure 8.5 A Dean-Stark trap collects in the blind reservoir the water produced from a reaction. Volume graduations on this reservoir enable reaction progress to be followed by the amount of water that has been removed. In some traps the reservoir can be drained by a stopcock

Bluetooth can support voice and data traf c based on polling WiMedia has four access categories in its prioritized channel access (PCA) mode, and real-time traf c can use its distributed reservation protocol (DRP) mode The four access categories in PCA are background, best effort, video, and voice traf c Similarly, IEEE 80211e EDCA has four traf c access categories: background, best effort, video, and voice WiMedia PCA is derived from IEEE 80211e EDCA Cellular networks 2G and above can support at least voice and data UMTS can support four traf c classes: background, interactive, streaming, and conversational WiMax can support at least four scheduling services: best effort, non-real-time polling, real-time polling, and unsolicited grant Thus, it may not be possible to have one-to-one mapping of traf c classes across all the access technologies..